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Title: Determination of the Pt spin diffusion length by spin-pumping and spin Hall effect

The spin diffusion length of Pt at room temperature and at 8 K is experimentally determined via spin pumping and spin Hall effect in permalloy/Pt bilayers. Voltages generated during excitation of ferromagnetic resonance from the inverse spin Hall effect and anisotropic magnetoresistance effect were investigated with a broadband approach. Varying the Pt layer thickness gives rise to an evolution of the voltage line shape due to the superposition of the above two effects. By studying the ratio of the two voltage components with the Pt layer thickness, the spin diffusion length of Pt can be directly extracted. We obtain a spin diffusion length of ∼1.2 nm at room temperature and ∼1.6 nm at 8 K.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. (Ecuador)
  3. Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22217754
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ANISOTROPY; DIFFUSION LENGTH; ELECTRIC POTENTIAL; FERROMAGNETIC RESONANCE; HALL EFFECT; LAYERS; MAGNETORESISTANCE; PERMALLOY; PLATINUM; SHAPE; SPIN; TEMPERATURE RANGE 0273-0400 K; THICKNESS