Chirality control of the spin structure in monoaxial helimagnets by using charge current is theoretically investigated. The classical Heisenberg model has two degenerate helical states that are characterized by the chirality. In a recent experiment, it has been shown that the chirality of the spin structure can be controlled by applying a charge current during the field-decreasing process [Jiang et al., Nat. Commun. 11, 1601 (2020)]. We reproduced this experiment by numerical calculations based on the Landau–Lifshitz–Gilbert equation with the spin-transfer torque. We show that the damping torque and spin-transfer torque are responsible for the controllability. In addition, we theoretically propose more convenient forms of chirality control: instantaneous switching of chirality and zero-field control by using a ferromagnet junction. Such improved controllability may pave the way to spintronics based on the chirality degree of freedom.
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25 January 2021
Research Article|
January 27 2021
Chirality control of the spin structure in monoaxial helimagnets by charge current
Jun-ichiro Ohe
;
Jun-ichiro Ohe
a)
1
Department of Physics, Toho University
, 2-2-1 Miyama, Funabashi 274-8510, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Yoshinori Onose
Yoshinori Onose
2
Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
Search for other works by this author on:
Jun-ichiro Ohe
1,a)
Yoshinori Onose
2
1
Department of Physics, Toho University
, 2-2-1 Miyama, Funabashi 274-8510, Japan
2
Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 118, 042407 (2021)
Article history
Received:
November 13 2020
Accepted:
January 13 2021
Citation
Jun-ichiro Ohe, Yoshinori Onose; Chirality control of the spin structure in monoaxial helimagnets by charge current. Appl. Phys. Lett. 25 January 2021; 118 (4): 042407. https://doi.org/10.1063/5.0037357
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