Sizable spin-transfer torque in Bi/Ni80Fe20 bilayer film
M. Matsushima (1), S. Miwa (2), S. Sakamoto (2), T. Shinjo (1), R., Ohshima (1), Y. Ando (1), Y. Fuseya (2), M. Shiraishi (1) (1. Kyoto Univ.,, 2. ISSP, Univ. Tokyo, 3. Univ. Electro-Communications)
TL;DR
This study demonstrates significant spin-transfer torque in Bi/Ni80Fe20 bilayer films, highlighting the importance of material combinations for efficient spin conversion in spin-orbitronics applications.
Contribution
It provides experimental evidence of sizable spin-transfer torque in Bi/Ni80Fe20 bilayers, contrasting with previous findings and emphasizing material-specific effects.
Findings
Sizable spin-transfer torque observed in Bi/Ni80Fe20 bilayers
Material combination crucial for effective spin conversion in Bi-based systems
Contrast with negligible spin conversion in Bi/yittrium-iron-garnet bilayers
Abstract
The search for efficient spin conversion in Bi has attracted great attention in spin-orbitronics. In the present work, we employ spin-torque ferromagnetic resonance to investigate spin conversion in Bi/Ni80Fe20(Py) bilayer films with continuously varying Bi thickness. In contrast with previous studies, sizable spin-transfer torque (i.e., a sizable spin-conversion effect) is observed in Bi/Py bilayer film. Considering the absence of spin conversion in Bi/yttrium-iron-garnet bilayers and the enhancement of spin conversion in Bi-doped Cu, the present results indicate the importance of material combinations to generate substantial spin-conversion effects in Bi.
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