2022年第69回応用物理学会春季学術講演会

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一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.1 新物質・新機能創成(作製・評価技術)

[22p-E205-1~16] 10.1 新物質・新機能創成(作製・評価技術)

2022年3月22日(火) 13:45 〜 18:15 E205 (E205)

大矢 忍(東大)、関 宗俊(東大)、松野 丈夫(阪大)

14:30 〜 14:45

[22p-E205-4] Observation of non-collinear antiferromagnetic domain structure in epitaxial Mn3Sn thin films

〇(M1)Tomohiro Uchimura1,2、Ju-Young Yoon1,2、Yuma Sato1,3、Yutaro Takeuchi4、Shun Kanai1,5,6,7,8、Ryota Takechi1,2、Keisuke Kishi1,2、Yuta Yamane1,9、Samik DuttaGupta1,6,7、Jun'ichi Ieda10、Hideo Ohno1,2,3,4,6,7,11、Shunsuke Fukami1,2,3,4,6,7,11 (1.Laboratory for Nanoelectronics and Spintronics, RIEC, Tohoku Univ.、2.Graduate School of Engineering, Tohoku Univ.、3.School of Engineering, Tohoku Univ.、4.WPI-AIMR, Tohoku Univ.、5.DEFS, Tohoku Univ.、6.CSRN, Tohoku Univ.、7.CSIS, Tohoku Univ.、8.PRESTO, JST、9.FRIS, Tohoku Univ.、10.ASRC, JAEA、11.CIES, Tohoku Univ.)

キーワード:spintronics, non-collinear antiferromagnet, magneto-optical Kerr effect

Non-collinear antiferromagnetic D019-Mn3Sn has recently attracted increasing attention in spintronics owing to its topologically nontrivial phenomena. Here, we observe domain structures of (1-100)-oriented Mn3Sn thin films with various compositions using MOKE, and discuss on the reversal process and its consequences. From MOKE images, the domain structures reversed by external magnetic field is observed. In addition, we find that the reversal starts with a nucleation of domains dispersed in the film, followed by an anisotropic propagation of domain wall. We also find that the amplitude of the Kerr rotation angle varies with the composition of Mn-Sn, and the result is consistent with the reversible area revealed from the domain observation. Furthermore, the structural analysis indicates that the observed composition dependence can be attributed to formations of grains with different crystalline phases or crystallographic orientations. Our study provides a basic magneto-optical properties for the exploration of unraveled unique properties of non-collinear antiferromagnets.