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Title: Enhancement of the anti-damping spin torque efficacy of platinum by interface modification

We report a strong enhancement of the efficacy of the spin Hall effect (SHE) of Pt for exerting anti-damping spin torque on an adjacent ferromagnetic layer by the insertion of ≈0.5 nm layer of Hf between a Pt film and a thin, ≤2 nm, Fe{sub 60}Co{sub 20}B{sub 20} ferromagnetic layer. This enhancement is quantified by measurement of the switching current density when the ferromagnetic layer is the free electrode in a magnetic tunnel junction. The results are explained as the suppression of spin pumping through a substantial decrease in the effective spin-mixing conductance of the interface, but without a concomitant reduction of the ferromagnet's absorption of the SHE generated spin current.
Authors:
; ; ;  [1] ; ;  [1] ;  [2]
  1. Cornell University, Ithaca, New York 14853 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22412537
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 22; Other Information: (c) 2015 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; COBALT BORIDES; CURRENT DENSITY; FERROMAGNETIC MATERIALS; FILMS; HAFNIUM; HALL EFFECT; IRON COMPOUNDS; LAYERS; PLATINUM; SPIN; SUPERCONDUCTING JUNCTIONS; TUNNEL EFFECT