Negative Magnetoresistance Generated by Combination of Spin-Orbit Interaction and Applied Magnetic Field

作者：Sakai Masamichi^*; Kodama Daisuke; Sakuraba Takahito; Honda Zentaro; Hasegawa Shigehiko; Kitajima Akira; Oshima Akihiro; Higuchi Koji; Nakamuray Osamu

来源：Japanese Journal of Applied Physics, 2012, 51(2): 023001.

DOI：10.1143/JJAP.51.023001

We have theoretically studied a negative magnetoresistance (MR) the mechanism of which is completely different from conventional mechanisms, i.e., spin-related mobility-increased mechanisms and orbital-motion-related mechanisms including a quantum interference effect. Our proposed negative MR is caused by the interplay between a spin-orbit interaction (SOI) and the Lorentz force due to an externally applied magnetic field. We have phenomenologically approached this mechanism using the Drude-like model, in which the carrier scattering by SOI is considered as a transverse scattering term in addition to the longitudinal scattering term due to usual collisions and the Lorentz force term. Also, the possibility of observing our proposed negative MR was discussed by comparing our prediction with experimental results for Ni and Gd films, which were newly measured in this study.

• 出版日期2012-2