Monoaxial chiral magnets exhibit a chiral conical magnetic state in a magnetic field parallel to the chiral axis. The conical spins carry the potential for nonreciprocal transport phenomena, as they break both spatial inversion and time reversal symmetries. Here, we study the spin-dependent transport in the chiral conical magnetic state, using the Landauer method based on Green's functions for a one-dimensional Kondo lattice model. We show that the system exhibits nonreciprocal spin transport, which depends on the chirality, period, cone angle, and polarization of the spin current. In particular, we find the distinct cone angle dependence between the spin textures with long and short periods. We also show that the nonreciprocity is related to the spin states of itinerant electrons near the leads. Our results indicate that the chiral cone acts as a spin-current diode, which can be flexibly controlled by a magnetic field.
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1 July 2019
Research Article|
July 01 2019
Spin-current diode with a monoaxial chiral magnet
Shun Okumura;
Shun Okumura
a)
1
Department of Applied Physics, The University of Tokyo
, Tokyo 113-8656, Japan
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Hiroaki Ishizuka
;
Hiroaki Ishizuka
1
Department of Applied Physics, The University of Tokyo
, Tokyo 113-8656, Japan
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Yasuyuki Kato;
Yasuyuki Kato
1
Department of Applied Physics, The University of Tokyo
, Tokyo 113-8656, Japan
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Jun-ichiro Ohe;
Jun-ichiro Ohe
2
Department of Physics, Toho University
, Chiba 274-8510, Japan
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Yukitoshi Motome
Yukitoshi Motome
1
Department of Applied Physics, The University of Tokyo
, Tokyo 113-8656, Japan
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a)
Electronic mail: s.okumura@aion.t.u-tokyo.ac.jp
Appl. Phys. Lett. 115, 012401 (2019)
Article history
Received:
March 29 2019
Accepted:
June 13 2019
Citation
Shun Okumura, Hiroaki Ishizuka, Yasuyuki Kato, Jun-ichiro Ohe, Yukitoshi Motome; Spin-current diode with a monoaxial chiral magnet. Appl. Phys. Lett. 1 July 2019; 115 (1): 012401. https://doi.org/10.1063/1.5097866
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