[16a-D419-1~11] 10.2 スピン基盤技術・萌芽的デバイス技術

▼ [16a-D419-2] Helimagnet-based spintronics: control and detection of magnetic chirality

〇Hidetoshi Masuda¹、Takeshi Seki¹、Jun-ichiro Ohe²、Yoichi Nii^1,3、Hiroto Masuda¹、Koki Takanashi^1,4,5、Yoshinori Onose¹ (1.IMR, Tohoku Univ.、2.Dep. Phys., Toho Univ.、3.JST PRESTO、4.CSIS, Tohoku Univ.、5.ASRC, JAEA)

キーワード：helical magnet, chirality switching

Helimagnetic structures, in which the magnetic moments are spirally ordered, host an internal degree of freedom called chirality (or helicity) corresponding to the handedness of the spiral. The chirality seems quite robust against disturbances and is therefore promising for next-generation magnetic memory. While the chirality control and detection were recently achieved by the electric currents under magnetic fields in a metallic helimagnet[1], problems such as cumbersome control and detection methods and low working temperatures have to be solved for practical applications. Here, we show chirality switching by electric current pulses at room temperature in a thin-film MnAu₂ helimagnetic conductor[2]. Furthermore, zero-field detection of chirality was shown in a MnAu₂/Pt bilayer device[3]. These results pave the way to the future helimagnet-based spintronics.
[1] N. Jiang et al. Nat. Commun. 11, 1601 (2020). [2] H. Masuda et al. arXiv: 2205.13112. [3] H. Masuda et al. arXiv: 2212.10980.