skip to main content

Title: Modulation of effective damping constant using spin Hall effect

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.
Authors:
;  [1] ;  [2] ; ;  [1] ;  [3] ;  [4] ;  [2]
  1. Magnetic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047 (Japan)
  2. (Japan)
  3. International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044 (Japan)
  4. Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198 (Japan)
Publication Date:
OSTI Identifier:
22283052
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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