Room temperature chirality switching and detection in a helimagnetic MnAu2 thin film

Hidetoshi Masuda; Takeshi Seki; Jun-Ichiro Ohe; Yoichi Nii; Hiroto Masuda; Koki Takanashi; Yoshinori Onose

doi:10.1038/s41467-024-46326-4

Room temperature chirality switching and detection in a helimagnetic MnAu₂ thin film

Nat Commun. 2024 Mar 7;15(1):1999. doi: 10.1038/s41467-024-46326-4.

Authors

Hidetoshi Masuda¹, Takeshi Seki², Jun-Ichiro Ohe³, Yoichi Nii^{4

5}, Hiroto Masuda⁴, Koki Takanashi^{4

6

7}, Yoshinori Onose⁸

Affiliations

¹ Institute for Materials Research, Tohoku University, Sendai, Japan. hidetoshi.masuda.c8@tohoku.ac.jp.
² Institute for Materials Research, Tohoku University, Sendai, Japan. takeshi.seki@tohoku.ac.jp.
³ Department of Physics, Toho University, Funabashi, Japan.
⁴ Institute for Materials Research, Tohoku University, Sendai, Japan.
⁵ PRESTO, Japan Science and Technology Agency, Kawaguchi, Japan.
⁶ Center for Science and Innovation in Spintronics, Tohoku University, Sendai, Japan.
⁷ Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Japan.
⁸ Institute for Materials Research, Tohoku University, Sendai, Japan. yoshinori.onose.b4@tohoku.ac.jp.

Abstract

Helimagnetic structures, in which the magnetic moments are spirally ordered, host an internal degree of freedom called chirality corresponding to the handedness of the helix. The chirality seems quite robust against disturbances and is therefore promising for next-generation magnetic memory. While the chirality control was recently achieved by the magnetic field sweep with the application of an electric current at low temperature in a conducting helimagnet, problems such as low working temperature and cumbersome control and detection methods have to be solved in practical applications. Here we show chirality switching by electric current pulses at room temperature in a thin-film MnAu₂ helimagnetic conductor. Moreover, we have succeeded in detecting the chirality at zero magnetic fields by means of simple transverse resistance measurement utilizing the spin Berry phase in a bilayer device composed of MnAu₂ and a spin Hall material Pt. These results may pave the way to helimagnet-based spintronics.