[8p-E208-1~18] 10.2 Fundamental and exploratory device technologies for spin

4:15 PM - 4:30 PM JST(7:15 AM - 7:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[8p-E208-11] Spin-orbit torque-induced multi-rotational switching in a noncollinear antiferromagnet

〇(DC)Yuma Sato^1,2, Yutaro Takeuchi^3,4, Yuta Yamane^1,5, Shun Kanai^1,2,4,6,7,9, Shunsuke Fukami^1,2,4,6,8,10 (1.RIEC, Tohoku Univ., 2.Grad. Sch. Eng., Tohoku Univ., 3.CMSM, NIMS, 4.WPI-AIMR, Tohoku Univ., 5.FRIS, Tohoku Univ., 6.CSIS, Tohoku Univ., 7.EFS, Tohoku Univ., 8.CIES, Tohoku Univ., 9.QST, 10.InaRIS)

Keywords:

Antiferromagnetic spintronics,Noncolliear antiferromagnet,Spin-orbit torque

We report multi-rotational switching driven by spin-orbit torque in a noncollinear antiferromagnetic Mn₃Sn nanodot. By measuring the switching probability as a function of current-pulse duration and current density, we observe an unconventional switching phase diagram in which the switching-back threshold current density depends only weakly on pulse duration. Numerical simulations and an effective-potential model indicate that this behavior originates from the interplay of spin-orbit torque, in-plane-field-induced spatial asymmetry, and thermal fluctuations. Under these conditions, the noncollinear antiferromagnetic order undergoes multiple rotations before completing the switching. These results provide microscopic insight into current-induced switching dynamics in noncollinear antiferromagnets.