Modulation of effective damping constant using spin Hall effect

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

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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.

Original languageEnglish
Article number092408
JournalApplied Physics Letters
Volume104
Issue number9
DOIs
Publication statusPublished - 2014 Mar 3
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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