5d 電子系酸化物界面におけるスピン依存伝導

• Published in: 表面科学 Vol. 38; no. 12; pp. 614 - 619
• Main Authors: 松野 丈夫, MATSUNO Jobu
• Format: Journal Article
• Language: Japanese
• Published: The Surface Science Society of Japan 2017; 公益社団法人 日本表面科学会
• Subjects: iridium oxide; oxide interface; spin Hall effect; spin-orbit interaction; topological Hall effect
• ISSN: 0388-5321; 1881-4743; 1881-4743
• DOI: 10.1380/jsssj.38.614

Spin-orbit interaction in solids can be utilized for controlling spin-dependent transport phenomena. To realize them, we focus on thin films and interfaces of iridium (Ir) oxides since electron conduction there is dominated by 5d electrons with strong spin-orbit interaction. The first example is the inverse spin Hall effect, which converts a spin current into an electric voltage. The performance of IrO2 as a spin-current detector is better than those of noble metals. The second is the topological Hall effect originating from magnetic skyrmions. The epitaxial bilayers consisting of SrRuO3 and SrIrO3 enable us to generate skyrmions through artificially broken inversion symmetry at the interfaces. These results can be a step toward future spintronics.