Modulation of effective damping constant using spin Hall effect

Shinya Kasai; Kouta Kondou; Hiroaki Sukegawa; Seiji Mitani; Kazuhito Tsukagoshi; Yoshichika Otani

doi:10.1063/1.4867649

Modulation of effective damping constant using spin Hall effect

Shinya Kasai, Kouta Kondou, Hiroaki Sukegawa, Seiji Mitani, Kazuhito Tsukagoshi, Yoshichika Otani

研究成果: Article › 査読

30 被引用数 (Scopus)

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We have investigated modulation of the effective damping constant α_eff via spin currents through the spin Hall effect for Permalloy/Pt bilayer films with various thicknesses. The observed linear and sinusoidal dependences of current density and field direction on α_eff are in agreement with the analytical model. By comparing the thickness dependence of spin Hall angle obtained from the damping modulation with that previously obtained by spin-torque-induced ferromagnetic resonance, we show that there is no clear extrinsic contribution in the present method. We also show the large modulation of the effective damping constant (down to ∼20%) in the high-current-density region.

本文言語	English
論文番号	092408
ジャーナル	Applied Physics Letters
巻	104
号	9
DOI	https://doi.org/10.1063/1.4867649
出版ステータス	Published - 2014 3月 3
外部発表	はい

ASJC Scopus subject areas

物理学および天文学（その他）

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10.1063/1.4867649

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abstract = "We have investigated modulation of the effective damping constant αeff via spin currents through the spin Hall effect for Permalloy/Pt bilayer films with various thicknesses. The observed linear and sinusoidal dependences of current density and field direction on αeff are in agreement with the analytical model. By comparing the thickness dependence of spin Hall angle obtained from the damping modulation with that previously obtained by spin-torque-induced ferromagnetic resonance, we show that there is no clear extrinsic contribution in the present method. We also show the large modulation of the effective damping constant (down to ∼20%) in the high-current-density region.",

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AU - Kasai, Shinya

AU - Kondou, Kouta

AU - Sukegawa, Hiroaki

AU - Mitani, Seiji

AU - Tsukagoshi, Kazuhito

AU - Otani, Yoshichika

PY - 2014/3/3

Y1 - 2014/3/3

N2 - We have investigated modulation of the effective damping constant αeff via spin currents through the spin Hall effect for Permalloy/Pt bilayer films with various thicknesses. The observed linear and sinusoidal dependences of current density and field direction on αeff are in agreement with the analytical model. By comparing the thickness dependence of spin Hall angle obtained from the damping modulation with that previously obtained by spin-torque-induced ferromagnetic resonance, we show that there is no clear extrinsic contribution in the present method. We also show the large modulation of the effective damping constant (down to ∼20%) in the high-current-density region.

AB - We have investigated modulation of the effective damping constant αeff via spin currents through the spin Hall effect for Permalloy/Pt bilayer films with various thicknesses. The observed linear and sinusoidal dependences of current density and field direction on αeff are in agreement with the analytical model. By comparing the thickness dependence of spin Hall angle obtained from the damping modulation with that previously obtained by spin-torque-induced ferromagnetic resonance, we show that there is no clear extrinsic contribution in the present method. We also show the large modulation of the effective damping constant (down to ∼20%) in the high-current-density region.

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Modulation of effective damping constant using spin Hall effect

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