Lidé

Mgr. Jan Zemen, Ph.D.

Všechny publikace

The Impact of Local Strain Fields in Noncollinear Antiferromagnetic Films

  • Autoři: Johnson, F., Rendell-Bhatti, F., Esser, B.D., Hussey, A., McComb, D.W., Mgr. Jan Zemen, Ph.D., Boldrin, D., Cohen, L.F.
  • Publikace: Advanced Materials. 2024, 36(27), 0935-9648-0935-9658. ISSN 0935-9648.
  • Rok: 2024
  • DOI: 10.1002/adma.202401180
  • Odkaz: https://doi.org/10.1002/adma.202401180
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Antiferromagnets hosting structural or magnetic order that breaks time reversal symmetry are of increasing interest for "beyond von Neumann" computing applications because the topology of their band structure allows for intrinsic physical properties, exploitable in integrated memory and logic function. One such group are the noncollinear antiferromagnets. Essential for domain manipulation is the existence of small net moments found routinely when the material is synthesized in thin film form and attributed to symmetry breaking caused by spin canting, either from the Dzyaloshinskii-Moriya interaction or from strain. Although the spin arrangement of these materials makes them highly sensitive to strain, there is little understanding about the influence of local strain fields caused by lattice defects on global properties, such as magnetization and anomalous Hall effect. This premise is investigated by examining noncollinear antiferromagnetic films that are either highly lattice mismatched or closely matched to their substrate. In either case, edge dislocation networks are generated and for the former case, these extend throughout the entire film thickness, creating large local strain fields. These strain fields allow for finite intrinsic magnetization in seemingly structurally relaxed films and influence the antiferromagnetic domain state and the intrinsic anomalous Hall effect. The properties of noncollinear antiferromagnets are highly sensitive to strain, including large local strain fields generated by dislocations. The influence of these on the global magnetization and transport properties is examined, finding that they enhance the magnetization but are deleterious to intrinsic properties important for application. This analysis is timely as efforts are made to integrate these materials into multilayer devices. image

Anomalous Nernst effect in Mn 3 NiN thin films

  • Autoři: Beckert, S., Godinho, J., Johnson, F., Kimák, J., Schmoranzerová, E., Mgr. Jan Zemen, Ph.D., Šobáň, Z., Olejník, K., Železný, J., Wunderlich, J., Němec, P., Kriegner, D., Thomas, A., Goennenwein, S., Cohen, L.F., Reichlová, H.
  • Publikace: PHYSICAL REVIEW B. 2023, 108(2), 024420-1-024420-9. ISSN 2469-9950.
  • Rok: 2023
  • DOI: 10.1103/PhysRevB.108.024420
  • Odkaz: https://doi.org/10.1103/PhysRevB.108.024420
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    The observation of a sizable anomalous Hall effect in magnetic materials with vanishing magnetization has renewed interest in understanding and engineering this phenomenon. Antiferromagnetic antiperovskites are one of the emerging material classes that exhibit a variety of interesting properties owing to a complex electronic band structure and magnetic ordering. Reports on the anomalous Nernst effect and its magnitude in this class of materials are, however, very limited. This scarcity may be partly due to the experimental difficulty of reliably quantifying the anomalous Nernst coefficient. Here, we report experiments on the anomalous Nernst effect in antiferromagnetic antiperovskite Mn3NiN thin films. Measurement of both the anomalous Hall and Nernst effects using the same sample and measurement geometry makes it possible to directly compare these two effects and quantify the anomalous Nernst coefficient and conductivity in Mn3NiN. We carefully evaluate the spatial distribution of the thermal gradient in the sample and use finite-element modeling to corroborate our experimental results.

Collinear and noncollinear ferrimagnetic phases in Mn4N investigated by magneto-optical Kerr spectroscopy

  • Autoři: Mgr. Jan Zemen, Ph.D.,
  • Publikace: Journal of Applied Physics. 2023, 134 203902-1-203902-13. ISSN 0021-8979.
  • Rok: 2023
  • DOI: 10.1063/5.0170621
  • Odkaz: https://doi.org/10.1063/5.0170621
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Ferrimagnetic antiperovskite Mn4N has received growing interest due to room-temperature observation of large perpendicular magnetic anisotropy, low saturation magnetization, and ultrafast response to external magnetic fields. Comprehensive understanding of the underlying magnetic structure is instrumental in design and fabrication of computer memory and logic devices. Magneto-optical spectroscopy provides deeper insight into the magnetic and electronic structure than magnetometry. Simulations of a magneto-optical Kerr effect in biaxially strained Mn4N are performed using density functional theory and linear response theory. We consider three ferrimagnetic phases, two collinear and one noncollinear, which have been investigated separately by earlier studies. The simulated spectra are compared to measured magneto-optical data available in recent literature. One of the collinear ferrimagnetic phases is found to be consistent with the measured spectra. We show that an admixture of the noncollinear phase, which is the ground state of unstrained Mn4N, further improves the agreement with measured spectra, and at the same time, it could explain the lower than predicted net moment and magnetic anisotropy observed in thin films on various substrates.

Room-temperature weak collinear ferrimagnet with symmetry-driven large intrinsic magneto-optic signatures

  • Autoři: Johnson, F., Zázvorka, J., Beran, L., Boldrin, D., Cohen, L.F., Mgr. Jan Zemen, Ph.D., Veis, M.
  • Publikace: PHYSICAL REVIEW B. 2023, 107 014404-1-014404-9. ISSN 2469-9950.
  • Rok: 2023
  • DOI: 10.1103/PhysRevB.107.014404
  • Odkaz: https://doi.org/10.1103/PhysRevB.107.014404
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Here we present a magnetic thin film with a weak ferrimagnetic (FIM) phase above the Néel temperature (TN = 240 K) and a noncollinear antiferromagnetic (AFM) phase below, exhibiting a small net magnetization due to strain-associated canting of the magnetic moments. A long-range ordered FIM phase has been predicted in related materials, but without symmetry analysis. We now perform this analysis and use it to calculate the magneto-optical Kerr effect (MOKE) spectra in the AFM and FIM phases. From the good agreement between the form of the measured and predicted MOKE spectra, we propose the AFM and FIM phases share the magnetic space group C2/m and that the symmetry-driven magneto-optic and magneto-transport properties are maximized at room temperature in the FIM phase due to the nonzero intrinsic Berry phase contribution present in these materials. A room temperature FIM with large optical and transport signatures, as well as sensitivity to lattice strain and magnetic field, has useful prospects for high-speed spintronic applications.

Identifying the octupole antiferromagnetic domain orientation in Mn3NiN by scanning anomalous Nernst effect microscopy

  • Autoři: Johnson, F., Kimák, J., Mgr. Jan Zemen, Ph.D., Šobáň, Z., Schmoranzerová, E., Godinho, J., Němec, P., Beckert, S., Reichlová, H., Boldrin, D., Wunderlich, J., Cohen, L.F.
  • Publikace: Applied Physics Letters. 2022, 120(23), 232402-1-232402-6. ISSN 0003-6951.
  • Rok: 2022
  • DOI: 10.1063/5.0091257
  • Odkaz: https://doi.org/10.1063/5.0091257
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    The intrinsic anomalous Nernst effect in a magnetic material is governed by the Berry curvature at the Fermi energy and can be realized in non-collinear antiferromagnets with vanishing magnetization. Thin films of (001)-oriented Mn3NiN have their chiral antiferromagnetic structure located in the (111) plane facilitating the anomalous Nernst effect unusually in two orthogonal in-plane directions. The sign of each component of the anomalous Nernst effect is determined by the local antiferromagnetic domain state. In this work, a temperature gradient is induced in a 50 nm thick Mn3NiN two micrometer-size Hall cross by a focused scanning laser beam, and the spatial distribution of the anomalous Nernst voltage is used to image and identify the octupole macrodomain arrangement. Although the focused laser beam width may span many individual domains, cooling from room temperature to the antiferromagnetic transition temperature in an in-plane magnetic field prepares the domain state, producing a checkerboard pattern resulting from the convolution of contributions from each domain. These images together with atomistic and micromagnetic simulations suggest an average macrodomain of the order of 1 mu m(2).

Latent heat induced deformation of PCB substrate: Measurement and simulation

  • DOI: 10.1016/j.csite.2022.102173
  • Odkaz: https://doi.org/10.1016/j.csite.2022.102173
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    The work evaluates the impact of latent heat (LH) absorbed or released by a solder alloy during melting or solidification, respectively, on changes of dimensions of materials surrounding of the solder alloy. Our sample comprises a small printed circuit board (PCB) with a blind via filled with lead-free alloy SAC305. Differential scanning calorimetry (DSC) was employed to obtain the amount of LH per mass and a thermomechanical analyzer was used to measure the thermally induced deformation. A plateau during melting and a peak during solidification were detected during the course of dimension change. The peak height reached 1.6 mu m in the place of the heat source and 0.3 mu m in the distance of 3 mm from the source. The data measured during solidification was compared to a numerical model based on the finite element method. An excellent quantitative agreement was observed which confirms that the transient expansion of PCB during cooling can be explained by the release of LH from the solder alloy during solidification. Our results have important implications for the design of PCB assemblies where the contribution of recalescence to thermal stress can lead to solder joint failure.

Magneto-thermal transport indicating enhanced Nernst response in FeCo/IrMn exchange coupled stacks

  • Autoři: Martini, M., Reichlova, H., Lee, Y., Dusíková, D., Mgr. Jan Zemen, Ph.D., Nielsch, K., Thomas, A.
  • Publikace: Applied Physics Letters. 2022, 121(21), 212405-1-212405-7. ISSN 0003-6951.
  • Rok: 2022
  • DOI: 10.1063/5.0113485
  • Odkaz: https://doi.org/10.1063/5.0113485
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    We present an analysis of magneto-thermal transport data in IrMn/FeCo bilayers based on the Mott relation and report an enhancement of the Nernst response in the vicinity of the blocking temperature. We measure all four transport coefficients of the longitudinal resistivity, anomalous Hall resistivity, Seebeck effect, and anomalous Nernst effect, and we show a deviation arising around the blocking temperature between the measured Nernst coefficient and the one calculated using the Mott rule. We attribute this discrepancy to spin fluctuations at the antiferromagnet/ferromagnet interface near the blocking temperature. The latter is estimated by magnetometry and magneto-transport measurements.

Quantitative Analysis of Nanorough Hydrogenated Si(111) Surfaces through Vibrational Spectral Assignment by Periodic DFT Calculations

  • DOI: 10.1021/acs.jpcc.1c09766
  • Odkaz: https://doi.org/10.1021/acs.jpcc.1c09766
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    We use periodic density functional theory (periodic DFT) to rigorously assign vibrational spectra measured on nanorough wet-processed hydrogenated Si(111) surfaces. We compare Si(111)-(1×1) surfaces etched by dilute HF and NH4F, featuring two vibrational patterns that systematically appear together. They are attributed to vibrations observed on vicinal surfaces featuring 112̅ and 1̅1̅2 steps terminated with monohydrides and dihydrides, respectively. For the first time, we fully assign vibration patterns of realistic silicon surfaces with variable nanoroughness directly by periodic DFT simulations involving contributions from isolated species but also contributions from highly coupled species forming standing waves. This work opens the path to a better quantitative characterization of imperfect and nanorough Si(111) surfaces from vibrational spectra.

Barocaloric properties of quaternary Mn3(Zn,In)N for room-temperature refrigeration applications

  • Autoři: Boldrin, D., Mendive-Tapia, E., Mgr. Jan Zemen, Ph.D., Staunton, J.B., Gomes, A.M., Ghivelder, L., Halpin, J., Gibbs, A.S., Aznar, A., Tamarit, J.L., Lloveras, P., Moya, X., Cohen, L.F.
  • Publikace: PHYSICAL REVIEW B. 2021, 104(13), 1-7. ISSN 2469-9950.
  • Rok: 2021
  • DOI: 10.1103/PhysRevB.104.134101
  • Odkaz: https://doi.org/10.1103/PhysRevB.104.134101
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    The magnetically frustrated manganese nitride antiperovskite family displays significant changes of entropy under hydrostatic pressure that can be useful for the emerging field of barocaloric cooling. Here we show that barocaloric properties of metallic antiperovskite Mn nitrides can be tailored for room-temperature application through quaternary alloying. We find an enhanced entropy change of vertical bar Delta S-t vertical bar = 37 J K-1 kg(-1) at the T-t = 300 K antiferromagnetic transition of quaternary Mn3Zn0.5In0.5N relative to the ternary end members. The pressure-driven barocaloric entropy change of Mn3Zn0.5In0.5N reaches vertical bar Delta S-BCE vertical bar = 20 J K-1 kg(-1) in 2.9 kbar. Our results open up a large phase space where compounds with improved barocaloric properties may be found.

FTIR Measurement of the Hydrogenated Si(100) Surface: The Structure-Vibrational Interpretation by Means of Periodic DFT Calculation

  • DOI: 10.1021/acs.jpcc.0c11176
  • Odkaz: https://doi.org/10.1021/acs.jpcc.0c11176
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    The periodic density functional theory (periodic DFT) method was employed for the interpretation of infrared radiation spectra (IR spectra) measured for the hydrogen-covered H/Si(100) surface after the standard step of native oxide removal by brief etching in 40% NH4F. The IR employed the attenuated total reflectance (ATR) method. The periodic DFT calculations of IR spectra focused on reconstructions of H/Si(100) that involved combinations of surface-terminating Si-H groups including the double-occupied dimer (DOD), dihydride (DH), and trihydride (TH). The IR spectra calculated with periodic DFT for H/Si(100) surfaces were compared with the IR spectra calculated by means of DFT in Si-H clusters. The periodic DFT provided considerably better and more reliable theoretical description of the IR spectra by keeping the periodicity of the silicon material that guaranteed proper spatial distribution of the Si-H species within H/Si(100).

Multifunctional antiperovskites driven by strong magnetostructural coupling

  • Autoři: Singh, H.K., Samathrakis, I., Fortunato, N.M., Mgr. Jan Zemen, Ph.D., Shen, C., Gutfleisch, O., Zhang, H.B.
  • Publikace: njp computational materials. 2021, 7(1), 1-9. ISSN 2057-3960.
  • Rok: 2021
  • DOI: 10.1038/s41524-021-00566-w
  • Odkaz: https://doi.org/10.1038/s41524-021-00566-w
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Based on density functional theory calculations, we elucidated the origin of multifunctional properties for cubic antiperovskites with noncollinear magnetic ground states, which can be attributed to strong isotropic and anisotropic magnetostructural coupling. Of 54 stable magnetic antiperovskites M(3)XZ (M = Cr, Mn, Fe, Co, and Ni; X = selected elements from Li to Bi except for noble gases and 4f rare-earth metals; and Z = C and N), 14 are found to exhibit the Gamma(4g)/Gamma(5g) (i.e., characterized by irreducible representations) antiferromagnetic magnetic configurations driven by frustrated exchange coupling and strong magnetocrystalline anisotropy. Using the magnetic deformation as an effective proxy, the isotropic magnetostructural coupling is characterized, and it is observed that the paramagnetic state is critical to understand the experimentally observed negative thermal expansion and to predict the magnetocaloric performance. Moreover, the piezomagnetic and piezospintronic effects induced by biaxial strain are investigated. It is revealed that there is not a strong correlation between the induced magnetization and anomalous Hall conductivities by the imposed strain. Interestingly, the anomalous Hall/Nernst conductivities can be significantly tailored by the applied strain due to the fine-tuning of the Weyl points energies, leading to promising spintronic applications.

Strain dependence of Berry-phase-induced anomalous Hall effect in the non-collinear antiferromagnet Mn3NiN

  • Autoři: Johnson, F., Boldrin, D., Mgr. Jan Zemen, Ph.D., Pesquera, D., Kim, J., Moya, X., Zhang, H., Singh, H.K., Samathrakis, I., Cohen, L.F.
  • Publikace: Applied Physics Letters. 2021, 119(222401), 1-6. ISSN 0003-6951.
  • Rok: 2021
  • DOI: 10.1063/5.0072783
  • Odkaz: https://doi.org/10.1063/5.0072783
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    The anomalous Hall effect (AHE) has been shown to be present in certain non-collinear antiferromagnets due to their symmetry-breaking magnetic structure, and its magnitude is dependent primarily on the non-zero components of the Berry curvature. In the non-collinear antiferromagnet Mn3NiN, the Berry phase contribution has been predicted to have strong strain dependence, although in practice, direct observation may be obscured by other strain-related influences—for instance, magnetic phase transitions mediated by strain. To unravel the various contributions, we examine the thickness and temperature dependence of the AHE for films grown on the piezoelectric substrate BaTiO3. We observe a systematic reduction in TN due to increased compressive strain as film thickness is reduced and a linear decrease in the AHE magnitude as the films are cooled from their ferrimagnetic phase above TN to their antiferromagnetic phase below. At 190 K, we applied an electric field across a 0.5 mm thick BaTiO3 substrate with a 50 nm thick Mn3NiN film grown on top and we demonstrate that at the coercive field of the piezoelectric substrate, the tensile in-plane strain is estimated to be of the order of 0.15%, producing a 20% change in AHE. Furthermore, we show that this change is, indeed, dominated by the intrinsic strain dependence of the Berry curvature.

Unidirectional magnetoresistance and spin-orbit torque in NiMnSb

  • Autoři: Železný, J., Fang, Z., Olejník, K., Patchett, J., Gerhard, F., Gould, C., Molenkamp, L.W., Gomez-Olivella, C., Mgr. Jan Zemen, Ph.D., Tichý, T., Jungwirth, T., Ciccarelli, C.
  • Publikace: PHYSICAL REVIEW B. 2021, 104(5), 1-13. ISSN 2469-9950.
  • Rok: 2021
  • DOI: 10.1103/PhysRevB.104.054429
  • Odkaz: https://doi.org/10.1103/PhysRevB.104.054429
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Spin-dependent transport phenomena due to relativistic spin-orbit coupling and broken space-inversion symmetry are often difficult to interpret microscopically, in particular when occurring at surfaces or interfaces. Here we present a theoretical and experimental study of spin-orbit torque and unidirectional magnetoresistance in a model room-temperature ferromagnet NiMnSb with inversion asymmetry in the bulk of this half-Heusler crystal. Aside from the angular dependence on magnetization, the competition of Rashba- and Dresselhaus-type spin-orbit couplings results in the dependence of these effects on the crystal direction of the applied electric field. The phenomenology that we observe highlights potential inapplicability of commonly considered approaches for interpreting experiments. We point out that, in general, there is no direct link between the current-induced nonequilibrium spin polarization inferred from the measured spin-orbit torque and the unidirectional magnetoresistance. We also emphasize that the unidirectional magnetoresistance has not only longitudinal but also transverse components in the electric field: current indices which complicate its separation from the thermoelectric contributions to the detected signals in common experimental techniques. We use the theoretical results to analyze our measurements of the on-resonance and off-resonance mixing signals in microbar devices fabricated from an epitaxial NiMnSb film along different crystal directions. Based on the analysis we extract an experimental estimate of the unidirectional magnetoresistance in NiMnSb.

Deterministic magnetic domain wall motion induced by pulsed anisotropy energy

  • Autoři: Rushforth, A.W., Rowan-Robinson, R., Mgr. Jan Zemen, Ph.D.,
  • Publikace: Journal of Physics D: Applied Physics. 2020, 53(16), ISSN 0022-3727.
  • Rok: 2020
  • DOI: 10.1088/1361-6463/ab6cc7
  • Odkaz: https://doi.org/10.1088/1361-6463/ab6cc7
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    We propose a method to induce deterministic motion of a magnetic domain wall in a nanowire by inducing short strain pulses uniformly along the nanowire. Via inverse magnetostriction, a strain pulse causes the magnetic anisotropy to vary uniformly on a timescale comparable to the magnetisation dynamics. The resultant torque on the magnetic moments within the domain wall cause it to move along the nanowire. Using numerical calculations we analyse in detail the dependence of the domain wall's motion on the material's parameters and on the anisotropy pulse profile, and we consider the specific case of the anisotropy induced by voltage pulses applied to a hybrid piezoelectric/ferromagnet device. The method will be applicable to a range of magnetic textures including skyrmions, solitons, and domain walls in antiferromagnets, and is prospective for applications in a range of areas including ultra-energy efficient information storage and processing, communications technologies, position encoding and biomedical science.

Effect of N, C, and B interstitials on the structural and magnetic properties of alloys with Cu3Au structure

  • Autoři: Opahle, I., Singh, H.K., Mgr. Jan Zemen, Ph.D., Gutfleisch, O., Zhang, H.
  • Publikace: Physical Review Research. 2020, 2(2), ISSN 2643-1564.
  • Rok: 2020
  • DOI: 10.1103/PhysRevResearch.2.023134
  • Odkaz: https://doi.org/10.1103/PhysRevResearch.2.023134
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    High-throughput density functional calculations are used to investigate the effect of interstitial B, C, and N atoms on 21 alloys reported to crystallize in the cubic Cu3Au structure. It is shown that the interstitials can have a significant impact on the magnetocrystalline anisotropy energy (MAE), the thermodynamic stability, and the magnetic ground-state structure, making these alloys interesting for hard magnetic, magnetocaloric, and other applications. For 29 alloy-interstitial combinations the formation of stable alloys with interstitial concentrations above 5% is expected. In Ni3Mn interstitial N induces a tetragonal distortion with substantial uniaxial MAE for realistic N concentrations. Mn3XNx (X = Rh, Ir, Pt, and Sb) compounds are identified as alloys with strong magnetocrystalline anisotropy. For Mn3Ir we find a strong enhancement of the MAE upon N alloying in the most stable collinear ferrimagnetic state as well as in the noncollinear magnetic ground state. Mn3Ir and Mn3IrN also show interesting topological transport properties. The effects of N concentration and strain on the magnetic properties are discussed. Further, the huge impact of N on the MAE of Mn3Ir and a possible impact of interstitial N on amorphous Mn3Ir, a material that is indispensable in today's data storage devices, are discussed in relation to the electronic structure. For Mn3Sb, noncollinear, ferrimagnetic, and ferromagnetic states are very close in energy, making this material potentially interesting for magnetocaloric applications. For the investigated Mn alloys and competing phases, the determination of the magnetic ground state is essential for a reliable prediction of the phase stability.

Magnetic and Magneto-Optical Properties of Fe75-xMn25Gax Heusler-like Compounds

  • Autoři: Kral, D., Beran, L., Zeleny, M., Mgr. Jan Zemen, Ph.D., Antos, R., Hamrle, J., Zazvorka, J., Rames, M., Onderkova, K., Heczko, O., Veis, M.
  • Publikace: Materials. 2020, 13(3), ISSN 1996-1944.
  • Rok: 2020
  • DOI: 10.3390/ma13030703
  • Odkaz: https://doi.org/10.3390/ma13030703
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Fe75-xMn25Gax Heusler-like compounds were investigated in a wide range of Fe/Ga ratios while keeping the Mn content constant and equal 25 at% in order to elucidate the interplay between magnetic properties and composition. Materials were prepared by arc-melting from pure elements and subsequently annealed. Experimental investigations were focused on magnetization behavior in a wide temperature range from 4 to 1000 K and magnetic field up to 9 T. Optical and magneto-optical (MO) measurements were employed to shed more light on the magnetic state and electronic structure of investigated materials. Magnetization measurements indicated that in the vicinity of stoichiometry (Fe2MnGa) the compounds are ferro/ferrimagnetic, whereas the Fe-deficient compound is paramagnetic and at high Fe concentration the antiferromagnetic interaction prevails. Theoretical calculations of corresponding ordered and disordered stoichiometric compounds were carried out and compared to the experiment on the level of net magnetic moment as well as magneto-optical spectra. This comparison suggests that the Heusler crystal structure, L2(1), is not present even close to stoichiometry. Moreover, the comparison of density of states (DOS) for ordered and disordered structures allowed us to explain missing martensitic transformation (MT) in investigated materials.

Study of Friction Force in Electrodynamic Rail Accelerator: Experiment and Interpretation Using FEM Modelling

  • DOI: 10.3390/physics2040034
  • Odkaz: https://doi.org/10.3390/physics2040034
  • Pracoviště: Katedra elektrotechnologie, Katedra elektroenergetiky
  • Anotace:
    The paper presents experimental data and a model of an electromagnetic rail accelerator. The model includes an equivalent circuit, magnetic field in the system and movement of the projectile (that is solved separately) which is computed numerically. The main results are compared with our experimental data and friction force during acceleration is evaluated.

Anomalous Hall effect in noncollinear antiferromagnetic Mn3NiN thin films

  • Autoři: Boldrin, D., Samathrakis, I., Mgr. Jan Zemen, Ph.D., Mihai, A.P., Zou, B., Johnson, F., Esser, B.D., McComb, D.W., Petrov, P., Zhang, H.B., Cohen, L.F.
  • Publikace: Physical Review Materials. 2019, 3 ISSN 2475-9953.
  • Rok: 2019
  • DOI: 10.1103/PhysRevMaterials.3.094409
  • Odkaz: https://doi.org/10.1103/PhysRevMaterials.3.094409
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    We have studied the anomalous Hall effect (AHE) in strained thin films of the frustrated antiferromagnet Mn3NiN. The AHE does not follow the conventional relationships with magnetization or longitudinal conductivity and is enhanced relative to that expected from the magnetization in the antiferromagnetic state below T-N = 260K. This enhancement is consistent with origins from the noncollinear antiferromagnetic structure, as the latter is closely related to that found in Mn3Ir and Mn3Pt where a large AHE is induced by the Berry curvature. As the Berry-phase-induced AHE should scale with spin-orbit coupling, yet larger AHE may be found in other members of the chemically flexible Mn(3)AN structure.

The Biaxial Strain Dependence of Magnetic Order in Spin Frustrated Mn3NiN Thin Films

  • Autoři: Boldrin, D., Johnoson, F., Thompson, R., Mihai, A.P., Zou, B., Mgr. Jan Zemen, Ph.D., Griffiths,, J., Gubeljak, P., Ormandy, K.L., Manuel, P., Khalyavin, D.D., Ouladdiaf, B., Qureshi, N., Petrov, P., Branford, W., Cohen, L.F.
  • Publikace: Advanced Functional Materials. 2019, 29 ISSN 1616-301X.
  • Rok: 2019
  • DOI: 10.1002/adfm.201902502
  • Odkaz: https://doi.org/10.1002/adfm.201902502
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Multicomponent magnetic phase diagrams are a key property of functional materials for a variety of uses, such as manipulation of magnetization for energy efficient memory, data storage, and cooling applications. Strong spin-lattice coupling extends this functionality further by allowing electric-field-control of magnetization via strain coupling with a piezoelectric. Here this work explores the magnetic phase diagram of piezomagnetic Mn3NiN thin films, with a frustrated noncollinear antiferromagnetic (AFM) structure, as a function of the growth induced biaxial strain. Under compressive strain, the films support a canted AFM state with large coercivity of the transverse anomalous Hall resistivity, rho(xy), at low temperature, that transforms at a well-defined Neel transition temperature (T-N) into a soft ferrimagnetic-like (FIM) state at high temperatures. In stark contrast, under tensile strain, the low temperature canted AFM phase transitions to a state where rho(xy) is an order of magnitude smaller and therefore consistent with a low magnetization phase. Neutron scattering confirms that the high temperature FIM-like phase of compressively strained films is magnetically ordered and the transition at T-N is first-order. The results open the field toward future exploration of electric-field-driven piezospintronic and thin film caloric cooling applications in both Mn3NiN itself and the broader Mn(3)AN family.

Giant Piezomagnetism in Mn3NiN

  • Autoři: Boldrin, D., Mihai, A.P., Zou, B., Mgr. Jan Zemen, Ph.D., Thompson, R., Ware, E., Neamtu, B.V., Ghivelder, L., Esser, B., McComb, D.W., Petrov, P., Cohen, L.F.
  • Publikace: ACS Applied Materials and Interfaces. 2018, 10(22), 18863-18868. ISSN 1944-8244.
  • Rok: 2018
  • DOI: 10.1021/acsami.8b03112
  • Odkaz: https://doi.org/10.1021/acsami.8b03112
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Controlling magnetism with electric field directly or through strain-driven piezoelectric coupling remains a key goal of spintronics. Here, we demonstrate that giant piezomagnetism, a linear magneto-mechanic coupling effect, is manifest in antiperovskite Mn3NiN, facilitated by its geometrically frustrated antiferromagnetism opening the possibility of new memory device concepts. Films of Mn3NiN with intrinsic biaxial strains of ±0.25% result in Néel transition shifts up to 60 K and magnetization changes consistent with theory. Films grown on BaTiO3 display a striking magnetization jump in response to uniaxial strain from the intrinsic BaTiO3 structural transition, with an inferred 44% strain coupling efficiency and a magnetoelectric coefficient α (where α = dB/dE) of 0.018 G cm/V. The latter agrees with the 1000-fold increase over Cr2O3 predicted by theory. Overall, our observations pave the way for further research into the broader family of Mn-based antiperovskites where yet larger piezomagnetic effects are predicted to occur at room temperature.

Interface-Generated Spin Currents

  • Autoři: Amin, V.P., Mgr. Jan Zemen, Ph.D., Stiles, M.D.
  • Publikace: Physical Review Letters. 2018, 121(13), 136805-1-136805-6. ISSN 0031-9007.
  • Rok: 2018
  • DOI: 10.1103/PhysRevLett.121.136805
  • Odkaz: https://doi.org/10.1103/PhysRevLett.121.136805
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Transport calculations based on ab initio band structures reveal large interface-generated spin currents at Co/Pt, Co/Cu, and Pt/Cu interfaces. These spin currents are driven by in-plane electric fields but flow out of plane and can have similar strengths to spin currents generated by the spin Hall effect in bulk Pt. Each interface generates spin currents with polarization along (z) over cap x E, where (z) over cap is the interface normal and E denotes the electric field. The Co/Cu and Co/Pt interfaces additionally generate spin currents with polarization along (m) over cap x ((z) over cap x E), where (m) over cap gives the magnetization direction of Co. The latter spin polarization is controlled by-but not aligned with-the magnetization, providing a novel mechanism for generating spin torques in magnetic trilayers.

Multisite Exchange-Enhanced Barocaloric Response in Mn3NiN

  • Autoři: Boldrin, D., Mendive-Tapia, E., Mgr. Jan Zemen, Ph.D., Staunton, J.B., Hansen, T., Aznar, A., Tamarit, J.L., Barrio, M., Lloveras, P., Kim, J., Moya, X., Cohen, L.F.
  • Publikace: Physical Review X. 2018, 8(4), ISSN 2160-3308.
  • Rok: 2018
  • DOI: 10.1103/PhysRevX.8.041035
  • Odkaz: https://doi.org/10.1103/PhysRevX.8.041035
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    We study the barocaloric effect (BCE) in the geometrically frustrated antiferromagnet Mn3NiN across the Neel transition temperature. Experimentally, we find a larger barocaloric entropy change by a factor of 1.6 than that recently discovered in the isostructural antiperovskite Mn3GaN despite significantly greater magnetovolume coupling in Mn3GaN. By fitting experimental data to theory, we show that the larger BCE of Mn3NiN originates from multisite exchange interactions amongst the local Mn magnetic moments and their coupling with itinerant electron spins. Using this framework, we discuss the route to maximize the BCE in the wider Mn(3)AN family.

Frustrated magnetism and caloric effects in Mn-based antiperovskite nitrides: Ab initio theory

  • Autoři: Mgr. Jan Zemen, Ph.D., Mendive-Tapia, E., Gercsi, Z., Banerjee, R., Staunton, J.B., Sandeman, K.G.
  • Publikace: PHYSICAL REVIEW B. 2017, 95(18), ISSN 2469-9950.
  • Rok: 2017
  • DOI: 10.1103/PhysRevB.95.184438
  • Odkaz: https://doi.org/10.1103/PhysRevB.95.184438
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    We model changes of magnetic ordering in Mn-based antiperovskite nitrides driven by biaxial lattice strain at zero and at finite temperature. We employ a noncollinear spin-polarized density functional theory to compare the response of the geometrically frustrated exchange interactions to a tetragonal symmetry breaking (the so called piezomagnetic effect) across a range of Mn3AN (A = Rh, Pd, Ag, Co, Ni, Zn, Ga, In, Sn) at zero temperature. Building on the robustness of the effect we focus on Mn3GaN and extend our study to finite temperature using the disordered local moment (DLM) first-principles electronic structure theory to model the interplay between the ordering of Mn magnetic moments and itinerant electron states. We discover a rich temperature-strain magnetic phase diagram with two previously unreported phases stabilized by strains larger than 0.75% and with transition temperatures strongly dependent on strain. We propose an elastocaloric cooling cycle crossing two of the available phase transitions to achieve simultaneously a large isothermal entropy change (due to the first-order transition) and a large adiabatic temperature change (due to the second-order transition).

Piezomagnetism as a counterpart of the magnetovolume effect in magnetically frustrated Mn-based antiperovskite nitrides

  • Autoři: Mgr. Jan Zemen, Ph.D., Gercsi, Z., Sandeman, K.G.
  • Publikace: PHYSICAL REVIEW B. 2017, 96(2), ISSN 2469-9950.
  • Rok: 2017
  • DOI: 10.1103/PhysRevB.96.024451
  • Odkaz: https://doi.org/10.1103/PhysRevB.96.024451
  • Pracoviště: Katedra elektrotechnologie
  • Anotace:
    Electric-field control of magnetization promises to substantially enhance the energy efficiency of device applications ranging from data storage to solid-state cooling. However, the intrinsic linear magnetoelectric effect is typically small in bulk materials. In thin films, electric-field tuning of spin-orbit-interaction phenomena (e.g., magnetocrystalline anisotropy) has been reported to achieve a partial control of the magnetic state. Here we explore the piezomagnetic effect (PME), driven by frustrated exchange interactions, which can induce a net magnetization in an antiferromagnet and reverse its direction via elastic strain generated piezoelectrically. Our ab initio study of PME in Mn-based antiperovskite nitrides identified an extraordinarily large PME in Mn3SnN available at room temperature. We explain the magnitude of PME based on features of the electronic structure and show an inverse proportionality between the simulated zero-temperature PME and the magnetovolume effect at the magnetic (Neel) transition measured by Takenaka et al. in nine antiferromagnetic Mn(3)AN systems.

Za stránku zodpovídá: Ing. Mgr. Radovan Suk