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Effect of Rashba interaction at normal metal/insulator interface on spinorbit torque of ferromagnet/normal metal/insulator trilayers

Effect of Rashba interaction at normal metal/insulator interface on spinorbit torque of ferromagnet/normal metal/insulator trilayers

  • 주제(키워드) Spin-orbit torque
  • 발행기관 한국물리학회
  • 발행년도 2019
  • 총서유형 Journal
  • DOI http://dx.doi.org/10.1016/j.cap.2019.08.025
  • KCI ID ART002533342
  • 본문언어 영어

초록/요약

Based on a spin drift-diffusion model, we theoretically investigate the spin-orbit torque in ferromagnet/normal metal/insulator trilayers with considering the Rashba interfacial spin-orbit coupling at the normal metal/insulator interface. We find that the spin-orbit torque shows the opposite normal-metal-thickness dependences for the bulk spin-orbit coupling effect in the normal metal layer and for the interfacial spin-orbit coupling effect at the normal metal/insulator interface, offering a way to disentangle these two spin-orbit coupling effects. Moreover, we show that the conventional interpretation based on the bulk spin-orbit coupling effect overestimates the spin Hall angle and underestimates the spin diffusion length of the normal metal layer, when the interfacial contribution is non-negligible. Our result, a concise analytic expression of the spin-orbit torque considering both bulk and interface spin-orbit coupling effects, will be useful to design and interpret experiments on spin-orbit torque experiments in ferromagnet/normal metal/insulator trilayers.

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