[8p-N303-1~16] 10.2 Fundamental and exploratory device technologies for spin

4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[8p-N303-10] Spin-orbit torque in sputtered W-Te/Ru/CoFeB thin film

〇Yukihiro Marui¹, Hideo Ohno^1,2,3,4, Shunsuke Fukami^1,2,3,4,5,6 (1.RIEC, Tohoku Univ., 2.WPI-AIMR, Tohoku Univ., 3.CSIS, Tohoku Univ., 4.CIES, Tohoku Univ., 5.Grad. Sch. Sci. Eng. Tohoku Univ., 6.InaRIS)

Keywords:

spintronics,spin orbit toruque,Weyl semimetal

Spin-orbit torque (SOT) has been extensively studied not only from a fundamental perspective but also for its potential in efficiently controlling magnetization for nonvolatile memory and neuromorphic computing applications. Recently, type-II Weyl semimetals have been shown to generate unconventional SOT in terms of the torque direction. WTe2 is a representative example, exhibiting both the unconventional characteristics and high SOT generation efficiency. However, the properties of sputtered WTe2/CoFeB films on silicon substrates-more relevant for practical applications-remain insufficiently explored. In this work, we deposit W-Te/Ru/CoFeB thin films on thermally oxidized silicon substrates using DC/RF magnetron sputtering and evaluate their effective spin Hall conductivity. We investigate the effects of the W-Te composition and underlayer materials on both the thermal durability and the magnitude of the effective spin Hall conductivity. Detailed findings will be discussed in the talk.