2022年第83回応用物理学会秋季学術講演会

講演情報

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)

[22a-B201-1~11] 10.1 新物質・新機能創成(作製・評価技術)

2022年9月22日(木) 09:00 〜 12:00 B201 (B201)

窪田 崇秀(東北大)、岡林 潤(東大)

10:00 〜 10:15

[22a-B201-5] Epitaxial growth of tetragonal Mn-based ultrathin films on highly mismatched substrate

〇(M1C)Naoki Kamata1,2、Shigemi Mizukami2,3、Kazuya Suzuki4,2 (1.Dept. Appl Phys, Touoku Univ.、2.WPI-AIMR, Tohoku Univ.、3.CSIS, Tohoku Univ.、4.ASRC, JAEA)

キーワード:spintronics and magnetics, thin film and surface

Tetragonal Mn-based alloy thin films are attractive materials as a perpendicularly magnetized electrode of functional magnetic tunnel junctions for memory devices, high frequency devices and sensors. However, their excellent properties have been only reported in single crystalline thin films grown on unpractical and expensive MgO single crystalline substrate. Therefore, the development of new epitaxial techniques using practical substrate will realize new applications of Mn-based alloys to the commercial applications. In this study, we focused on the single-crystal sapphire as a substrate, because this substrate has been broadly used in the epitaxial growth of compound semiconductors in mass production process. However, large lattice mismatch(~18%) and different crystal symmetry seem to be impossible to grow the high-quality epitaxial thin film of Mn-based alloy. In this study, we demonstrate the high-quality epitaxial growth of L10-MnGa ultrathin film on the sapphire(r-plane) substrate using bcc-Ta/Cr hybrid buffer layers.