期刊
PHYSICAL REVIEW B
卷 94, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.174430
关键词
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资金
- National Natural Science Foundation of China [51571109, 51601087, 11374145, 11304150]
- Natural Science Foundation of Jiangsu Province [BK20150565]
- Spins and Heat in Nanoscale Electronic Systems, an Energy Frontier Research Center - U.S. Department of Energy Basic Energy Science [SC0012670]
We report on the experimental study of the angular dependent magnetoresistance (MR) of heavy metal/ ferromagnetic insulator bilayer structures. Through altering the relative composition in heavy metal Pt-delta Ta1-delta alloy, we continuously tune its spin Hall angle from positive, crossing zero, and to negative and study its impact on the MR. Most notably, both spin Hall effect and MR disappear simultaneously in Pt0.32Ta0.68 (3 nm)/YIG when the effective spin Hall angle vanishes, evidencing the essential role of spin-orbit coupling in heavy metal for the MR. By introducing Fe impurities, we further identify that magnetic scattering is also essential to induce the MR in Pt/Fe-doped SiO2 at large magnetic field, where the MR ratio increases monotonically with doping level.
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