Noncollinear spin structure with weak ferromagnetism in NbMnP

Matsuda, M.; Zhang, Depei; Kuwata, Y.; Zhang, Qiang; Sakurai, Takahiro; Ohta, Hiromichi; Sugawara, Hitoshi; Takeda, Keiki; Hoshino, Junichi; Kotegawa, Hisashi

doi:10.1103/physrevb.104.174413

Phys. Rev. B

2021

DOI: 10.1103/physrevb.104.174413

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Noncollinear spin structure with weak ferromagnetism in NbMnP

M. Matsuda

Depei Zhang

Y. Kuwata

et al.

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Cited by 6 publications

References 23 publications

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Large anomalous Hall effect and unusual domain switching in an orthorhombic antiferromagnetic material NbMnP

Kotegawa,

Kuwata,

Huyen

et al. 2023

npj Quantum Mater.

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Specific antiferromagnetic (AF) spin configurations generate large anomalous Hall effects (AHEs) even at zero magnetic field through nonvanishing Berry curvature in momentum space. In addition to restrictions on AF structures, suitable control of AF domains is essential to observe this effect without cancellations among its domains; therefore, compatible materials remain limited. Here we show that an orthorhombic noncollinear AF material, NbMnP, acquired AF structure-based AHE and controllability of the AF domains. Theoretical calculations indicated that a large Hall conductivity of ~230 Ω−1cm−1 originated from the AF structure of NbMnP. Symmetry considerations explained the production of a small net magnetization, whose anisotropy enabled the generation and cancellation of the Hall responses using magnetic fields in different directions. Finally, asymmetric hysteresis in NbMnP shows potential for the development of controllability of responses in AF materials.

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Large anomalous Hall effect and unusual domain switching in an orthorhombic antiferromagnetic material NbMnP

Kotegawa,

Kuwata,

Huyen

et al. 2023

npj Quantum Mater.

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Generation of polarized spin-triplet Cooper pairings by magnetic barriers in superconducting junctions

2023

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Ferrimagnetic structure in the high-pressure phase of α−Mn

Araki,

Iwamoto,

Akiba

et al. 2024

Phys. Rev. B

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The α−Mn phase exhibits a large anomalous Hall effect (AHE) in its pressure-induced weak ferromagnetic (WFM) state, despite its relatively small spontaneous magnetization of ∼0.02μB/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, (−0.08±0.10)μB/Mn atom, is in agreement with the experimentally determined spontaneous magnetization. The observation of a magnetic reflection at q=(0,0,0) satisfies a key condition for the emergence of the AHE. Published by the American Physical Society 2024

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Noncollinear spin structure with weak ferromagnetism in NbMnP

Cited by 6 publications

References 23 publications

Large anomalous Hall effect and unusual domain switching in an orthorhombic antiferromagnetic material NbMnP

Large anomalous Hall effect and unusual domain switching in an orthorhombic antiferromagnetic material NbMnP

Generation of polarized spin-triplet Cooper pairings by magnetic barriers in superconducting junctions

Ferrimagnetic structure in the high-pressure phase of α−Mn

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