Spin-transfer torque induced by the spin anomalous Hall effect

Satoshi Iihama, Tomohiro Taniguchi, Kay Yakushiji, Akio Fukushima, Yoichi Shiota, Sumito Tsunegi, Ryo Hiramatsu, Shinji Yuasa, Yoshishige Suzuki, Hitoshi Kubota

研究成果: Article査読

83 被引用数 (Scopus)


The anomalous Hall effect in ferromagnets is a well-known phenomenon in which electromotive force is generated in the direction perpendicular to both the electric current and the magnetization. With nonmagnetic heavy metals, the generation of spin current by the spin Hall effect, as well as excitation of magnetization dynamics in an adjacent ferromagnet by spin-transfer torque, has been reported. However, the generation of a spin current in ferromagnets by the anomalous Hall effect has so far not been measured. Here we report the observation of spin current generation by the anomalous Hall effect through spin-transfer torque excitation in CoFeB/Cu/NiFe trilayer films. In this spin anomalous Hall effect, a spin current generated in the CoFeB by the anomalous Hall effect is injected into the NiFe and excites spin-transfer torque in the NiFe. This leads to a measurable modulation in the ferromagnetic resonance linewidth of the NiFe. The spin anomalous Hall angle in the CoFeB is estimated to be -0.14 ± 0.05, which is comparable to the spin Hall angle reported in heavy metals.

ジャーナルNature Electronics
出版ステータスPublished - 2018 2月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 器械工学
  • 電子工学および電気工学


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