Modulation of effective damping constant using spin Hall effect

Journal Article · Mon Mar 03 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4867649· OSTI ID:22283052

Kasai, Shinya; Kondou, Kouta ^[1]; Sukegawa, Hiroaki; Mitani, Seiji ^[1]; Tsukagoshi, Kazuhito ^[2]; Otani, Yoshichika ^[3]

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1. Magnetic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047 (Japan)
2. International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044 (Japan)
3. Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198 (Japan)

We have investigated modulation of the effective damping constant α{sub 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{sub 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.

• OSTI ID: 22283052
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPARATIVE EVALUATIONS
CURRENT DENSITY
DAMPING
ELECTRIC CURRENTS
FERROMAGNETIC RESONANCE
HALL EFFECT
INTERFACES
LAYERS
MODULATION
PERMALLOY
PLATINUM
SPIN
THICKNESS
THIN FILMS
TORQUE