講演情報
[8p-N303-8]Tungsten-Mediated Interlayer Exchange Coupling System Revisited
〇(P)Xueyao HOU1, Keita ITO1, Varun Kumar KUSHWAHA1, Takumi YAMAZAKI1, Junwei GU1, Shoya SAKAMOTO1,2, Zhenchao WEN3, Keisuke MASUDA3, Jun OKABAYASHI4, Takeshi SEKI1,2,5 (1.IMR, Tohoku Univ., 2.CSIS, Tohoku Univ., 3.CMSM, NIMS, 4.RCS, Univ. Tokyo, 5.SRIS, Tohoku Univ.)
キーワード：
antiferromagnetic spintronics、interlayer exchange coupling、spin-orbit torque
The synthetic antiferromagnet (SyAFs) have attracted interest for antiferromagnetic spintronics. A SyAF with the W interlayer is a candidate for improving the device performance. Nevertheless, there are very limited works on antiferromagnetic coupling through the W layer. This study systematically investigates the interlayer exchange coupling in CoFeB/W/CoFeB trilayers. Thin films with the W layer thickness of 1.2–2.0 nm showed spin-flip behavior, indicating the antiferromagnetic coupling. Structural analysis and extended x-ray absorption fine structure revealed the thickness-dependent changes in the W crystal structure. Transport measurements on microfabricated devices demonstrated spintronic functionality.