Theory of the spin Seebeck effect influenced by crystal-field excitations in TbFeO

Mori, Michiyasu; Tomasello, B.*; Ziman, T.*

Physical Review B, 111(1), p.014407_1 - 014407_12, 2025/01

https://doi.org/10.1103/PhysRevB.111.014407

Large spontaneous Hall effect with flexible domain control in the antiferromagnetic material TaMnP

Kotegawa, Hisashi*; Nakamura, Akira*; Huyen, V. T. N.*; Arai, Yuki*; To, Hideki*; Sugawara, Hitoshi*; Hayashi, Junichi*; Takeda, Keiki*; Tabata, Chihiro; Kaneko, Koji; et al.

Physical Review B, 110(21), p.214417_1 - 214417_8, 2024/12

https://doi.org/10.1103/PhysRevB.110.214417

Relationship between orbital moment anisotropy, magnetocrystalline anisotropy, and Dzyaloshinskii-Moriya interaction in W/Co/Pt trilayers

Chi, Z.*; Shibata, Goro; Fujimori, Atsushi; 15 of others*

Physical Review B, 110, p.184401_1 - 184401_8, 2024/11

https://doi.org/10.1103/PhysRevB.110.184401

Ferrimagnetic structure in the high-pressure phase of -Mn

Araki, Shingo*; Iwamoto, Kaisei*; Akiba, Kazuto*; Kobayashi, Tatsuo*; Munakata, Koji*; Kaneko, Koji; Osakabe, Toyotaka

Physical Review B, 110(9), p.094420_1 - 094420_7, 2024/09

https://doi.org/10.1103/PhysRevB.110.094420

The -Mn phase exhibits a large anomalous Hall effect (AHE) in its pressure-induced weak ferromagnetic (WFM) state, despite its relatively small spontaneous magnetization of 0.02 /Mn. To understand the underlying mechanism behind this AHE, we performed single crystal neutron diffraction measurements at 2.0 GPa to determine the magnetic structure of the WFM phase. Our investigation reveals a ferrimagnetic structure characterized by nearly collinear magnetic moments aligned along the [001] direction at sites I, II, III-1, and IV-1. In contrast, the small moments at sites III-2 and IV-2 lie within the (001) plane. The calculated net magnetization of this magnetic structure, (-0.0200.005)/Mn atom, is in excellent agreement with the experimentally determined spontaneous magnetization. The observation of a magnetic reflection at = (0, 0, 0) satisfies a key condition for the emergence of the AHE.

Elastic and inelastic neutron scattering experiments under high pressure in the frustrated antiferromagnet CuFeO

Terada, Noriki*; Khalyavin, D. D.*; Manuel, P.*; Asai, Shinichiro*; Masuda, Takatsugu*; Saito, Hiraku*; Nakajima, Taro*; Osakabe, Toyotaka

Physical Review B, 110(2), p.024406_1 - 024406_9, 2024/07

https://doi.org/10.1103/PhysRevB.110.024406

The frustrated antiferromagnet CuFeO exhibits pressure-induced complex magnetic phase transitions from the commensurate collinear (CM1) phase to several incommensurate noncollinear phases. To study the effect of high pressure on magnetic interactions, we performed neutron diffraction and inelastic neutron scattering experiments under high-pressure conditions. With increasing pressure, the CM1 ground state becomes less stable against application of a magnetic field even below the critical pressure ( 3 GPa), as proved by the significant reduction in the critical magnetic field from =7.5 T to 4.5 T at 2.1 GPa. Additionally, the energy gap in the spin-wave dispersion relation is reduced from 1.0 to 0.88 meV by the application of a pressure of = 2.1 GPa. Comparing the experimental results with spin-wave calculations revealed that the change in the spin-wave excitation can be explained by the reduction in either the uniaxial anisotropy term or the degree of separation in the nearest-neighbor exchange interactions.

Theory of the inverse Rashba-Edelstein effect induced by thermal spin injection

Hosokawa, Kaiji*; Yama, Masaki*; Matsuo, Mamoru; Kato, Takeo*

Physical Review B, 110(3), p.035309_1 - 035309_12, 2024/07

https://doi.org/10.1103/PhysRevB.110.035309

Nonlinear enhancement of coherent magnetization dynamics

Elyasi, M.*; Yamamoto, Kei; Hioki, Tomosato*; Makiuchi, Takahiko*; Shimizu, Hiroki*; Saito, Eiji*; Bauer, G. E. W.*

Physical Review B, 109(18), p.L180402_1 - L180402_7, 2024/05

https://doi.org/10.1103/PhysRevB.109.L180402

Magnetic structure and magnetoelectric properties of the spin-flop phase in LiFePO

Holm-Janas, S.*; Akaki, Mitsuru*; Fogh, E.*; Kihara, Takumi*; Le, M. D.*; Forino, P. C.*; Nikitin, S. E.*; Fennell, T.*; Painganoor, A.*; Vaknin, D.*; et al.

Physical Review B, 109(17), p.174413_1 - 174413_11, 2024/05

https://doi.org/10.1103/PhysRevB.109.174413

Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe

Tokiwa, Yoshifumi; Opletal, P.; Sakai, Hironori; Kambe, Shinsaku; Yamamoto, Etsuji; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; Aoki, Dai*; Haga, Yoshinori; et al.

Physical Review B, 109(14), p.L140502_1 - L140502_6, 2024/04

https://doi.org/10.1103/PhysRevB.109.L140502

The normal-conducting state of the superconductor UTe is studied by entropy analysis for magnetic fields along the -axis, obtained from magnetization using the relation . We observe a strong increase in entropy with magnetic field due to metamagnetic fluctuations (spatially uniform, ). The field dependence is well described by the Hertz-Millis-Moriya theory for quantum criticality of itinerant metamagnetism. Notably, the lower bound of the quantum-critical region coincides well with the position of the minimum in the superconducting transition temperature . Hence, our results suggest that fluctuations reinforce the superconductivity.

Inelastic neutron scattering of hydrogen in palladium studied by semiclassical dynamics

Shiga, Motoyuki; Thomsen, B.; Kimizuka, Hajime*

Physical Review B, 109(5), p.054303_1 - 054303_12, 2024/02

https://doi.org/10.1103/PhysRevB.109.054303

Inelastic neutron scattering spectra of hydrogen in palladium were calculated considering nuclear quantum effects at finite temperatures. A computational method combining semiclassical molecular dynamics based on path integrals and machine learning potentials was used. The calculated spectra agree well with the experimental spectra with respect to the positions and intensities of the peaks corresponding to the fundamental and first harmonic of the vibrational excitation of hydrogen atoms. Comparison with classical molecular dynamics shows that nuclear quantum effects play an essential role in the inelastic neutron scattering spectra.