Presentation Information
[8p-N303-14]Current-induced switching in epitaxial Mn3Sn thin films: A temperature dependent study
〇Kota Nihei1,2, Tomohiro Uchimura1,2, Jiahao Han1,3, Shun Kanai1,2,3,4,5,6,7, Hideo Ohno1,2,3,4,8, Shunsuke Fukami1,2,3,4,8,9 (1.RIEC, Tohoku Univ., 2.Grad. Sch. Eng., Tohoku Univ., 3.AIMR, Tohoku Univ., 4.CSIS, Tohoku Univ., 5.PRESTO, JST, 6.DEFS, Tohoku Univ., 7.QST, 8.CIES, Tohoku Univ., 9.InaRIS)
Keywords:
Spin-orbit torque,Joule heating,Epitaxial Mn3Sn film
Current-induced spin-orbit torques (SOTs) offer an efficient mechanism to switch the non-collinear antiferromagnetic order in Mn3Sn. While the switching experiments in epitaxial Mn3Sn films can be consistently understood by the SOT-driven spin dynamics, some studies with polycrystalline Mn3Sn films reveal a significant role of Joule heating, suggesting that the switching process involves a step that heats the sample close to or above the Néel temperature (TN) of Mn3Sn.
Here we evaluate the role of SOT and Joule heating from the temperature (T) dependence of current-induced switching in the (10-10)-oriented epitaxial Mn3Sn adjacent to heavy metal W/Ta. From the switching loops, we extract the switching current Isw at different T. By comparing the sample resistance as functions of T and current, we calibrate the current-induced temperature rise and, accordingly, determine I (T→TN), the threshold current that heats the sample to the Néel temperature. We find that Isw is well below I (T→TN) at 140~300 K, indicating that the sample maintains the non-collinear antiferromagnetic order during the switching. Our results suggest the persistent role of SOT and less dominant role of Joule heating in epitaxial Mn3Sn films than polycrystalline samples.
Here we evaluate the role of SOT and Joule heating from the temperature (T) dependence of current-induced switching in the (10-10)-oriented epitaxial Mn3Sn adjacent to heavy metal W/Ta. From the switching loops, we extract the switching current Isw at different T. By comparing the sample resistance as functions of T and current, we calibrate the current-induced temperature rise and, accordingly, determine I (T→TN), the threshold current that heats the sample to the Néel temperature. We find that Isw is well below I (T→TN) at 140~300 K, indicating that the sample maintains the non-collinear antiferromagnetic order during the switching. Our results suggest the persistent role of SOT and less dominant role of Joule heating in epitaxial Mn3Sn films than polycrystalline samples.