講演情報
[8p-N303-15]Pulse width dependence of spin-orbit torque switching in noncollinear antiferromagnetic Mn3Sn nanodot
〇(DC)Yuma Sato1,2, Yutaro Takeuchi3,4, Yuta Yamane1,5, Shun Kanai1,2,4,6,8,9, Hideo Ohno1,4,6,7, Shunsuke Fukami1,2,4,6,7,10 (1.Laboratory for Nanoelectronics and Spintronics, RIEC, Tohoku Univ., 2.Graduate School of Engineering, Tohoku Univ., 3.CMSM, NIMS, 4.WPI-AIMR, Tohoku Univ., 5.FRIS, Tohoku Univ., 6.CSIS, Tohoku Univ., 7.CIES, Tohoku Univ., 8.EFS, Tohoku Univ., 9.QST, 10.InaRIS)
キーワード：
spintronics、spin orbit torque、noncollinear antiferromagnet
Manipulating spins in antiferromagnets (AFMs) is crucial for AFM-based spintronic devices. In a noncollinear AFM Mn3Sn, bidirectional switching by spin-orbit torque (SOT) has been reported. Here, we investigate the pulse-width dependence of the SOT-induced switching in an epitaxial Mn3Sn nanodot on a Ta/W bilayer. The switching probability increases with current density, reaches unity, and then decreases, indicating a non-monotonic behavior. We define two threshold current densities and find that one depends on pulse width, while the other does not. This unusual behavior is reproduced by LLG simulations. These findings shed light on unconventional SOT switching dynamics in noncollinear AFMs.