[20a-D61-1~9] 10.1 新物質・新機能創成（作製・評価技術）

9:15 〜 9:30英語発表

[20a-D61-2] Magnetic Phase Diagram of Non-Collinear Antiferromagnet Mn_3+xSn_1-x Thin Films

〇Katarzyna Gas^1,2, Ju-Young Yoon^3,4, Yuma Sato^3,4, Hiroki Kubota^3,4, Jaroslaw Z. Domagala², Piotr Dluzewski², Yadhu K. Edathumkandy², Yutaro Takeuchi^3,5,6, Shun Kanai^{1,3,4,5,7,8,9}, Hideo Ohno^1,3,5,10, Maciej Sawicki^2,3, Shunsuke Fukami^1,3,4,5,10 (1.CSIS, Tohoku Univ., 2.Institute of Physics PAS, 3.Laboratory for Nanoelectronics and Spintronics, RIEC, Tohoku Univ., 4.Graduate School of Engineering, Tohoku Univ., 5.WPI-AIMR, Tohoku Univ., 6.ICYS, NIMS, 7.PRESTO, JST, 8.DEFS, Tohoku Univ., 9.NIQST, 10.CIES, Tohoku Univ)

キーワード：

Antiferromagnet、Weyl semimetal、Magnetic phase diagram

Since the physical properties of non-collinear antiferromagnetic Mn_3+xSn_1-x are expected to significantly change with the Mn content x through the position of the Fermi level as well as other factors, the development of systematic knowledge on the role of x in Mn_3+xSn_1-x is timely and important. We systematically investigate structural, magnetic, and magnetotransport properties of epitaxial m-planeMn_3+xSn_1-x thin layers (with -0.03 ≤ x ≤ +0.23) deposited by magnetron sputtering. Notably, we construct an x-dependent magnetic phase diagram, revealing the stabilization of the anti-chiral commensurate phase (inverse triangular antiferromagnetic order) with large AHE down to liquid helium temperatures for x > 0.15. We also find that the Néel temperature depends on the Mn composition and correlates with the simultaneous changes in the lattice parameter. Our work contributes to understanding Mn₃Sn thin films for novel device development.