Spin-current diode with a monoaxial chiral magnet

ORAL

Abstract

Chiral magnets often show interesting magnetic and transport properties associated with their peculiar spin textures. For instance, a monoaxial chiral magnet CrNb3S6 shows a chiral soliton lattice in a magnetic field, accompanied by peculiar temperature and field dependence of resistivity [1]. Such chiral spin textures potentially give rise to nonreciprocal transport phenomena, as they break spatial inversion and time reversal symmetries simultaneously [2]. However, nonreciprocal transport in the monoaxial chiral magnets has not been fully understood, especially for spin currents. Here, we investigate the spin-dependent transport properties in a chiral conical magnetic state using a one-dimensional Kondo lattice model. We calculate the conductance of spin current numerically by using the Landauer method based on Green’s functions. We show that the system exhibits nonreciprocal spin transport, which depends on the conical angle, the chirality of the magnetic structures, and the polarized direction of the spin current. We discuss the origin of the nonreciprocity by analyzing the spin states near the edges.

[1] Y. Togawa et al., J. Phys. Soc. Jpn. 85, 112001 (2016).
[2] G. Rikken et al., Phys. Rev. Lett. 87, 236602 (2001).

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Presenters

  • Shun Okumura

    Department of Applied Physics, University of Tokyo

Authors

  • Shun Okumura

    Department of Applied Physics, University of Tokyo

  • Hiroaki Ishizuka

    Department of Applied Physics, University of Tokyo, University of Tokyo

  • Yasuyuki Kato

    Department of Applied Physics, University of Tokyo, Department of Applied Physics, The University of Tokyo, University of Tokyo

  • Junichiro Ohe

    Department of Physics, Toho University

  • Yukitoshi Motome

    Department of Applied Physics, University of Tokyo, Department of Applied Physics, The University of Tokyo, The University of Tokyo, University of Tokyo, Applied Physics, University of Tokyo