Thickness dependence of spin-orbit torques in Pt/Co structures on epitaxial substrates

被引：6
|
作者：
Choi, Gaeun [1 ]
Ryu, Jeongchun [1 ]
Thompson, Ryan [2 ]
Choi, Jong-Guk [1 ]
Jeong, Jimin [1 ]
Lee, Sungjun [1 ]
Kang, Min-Gu [1 ]
Kohda, Makoto [2 ,3 ]
Nitta, Junsaku [2 ,3 ]
Park, Byong-Guk [1 ]
机构：
[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Daejeon 34141, South Korea
[2] Tohoku Univ, Dept Mat Sci, Sendai, Miyagi 9808579, Japan
[3] Tohoku Univ, Spintron Res Network, Sendai, Miyagi 9808579, Japan
来源：
APL MATERIALS | 2022年 / 10卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
MAGNETIZATION; MAGNITUDE; SYMMETRY; DYNAMICS;
D O I：
10.1063/5.0077074
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We investigate the Pt thickness dependence of spin-orbit torques (SOTs) in Co/Pt layers grown on single crystalline SrTiO3 and LaAlO3 and amorphous SiO2 substrates. We measure the SOT-induced effective damping-like fields and spin Hall magnetoresistances of the Co/Pt (t(pt)) samples, where t(pt) varies from 0.5 to 5.5 nm. We find that the Co/Pt layers grown on the single crystalline substrates show weaker thickness dependence of the SOT than the samples on the SiO2 substrate, which cannot be explained by the conventional bulk spin Hall effect in the Pt layer. This indicates that there is a non-negligible interfacial SOT originating from the Pt/substrate interface, which is more pronounced for thinner Pt. These results provide a way to design SOT material structures with enhanced SOT efficiency by incorporating interfacial SOT. (C) 2022 Author(s).
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收藏
页数：6
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