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Title: Suppression of spin pumping between Ni{sub 80}Fe{sub 20} and Cu by a graphene interlayer

We compare ferromagnetic resonance measurements of Permalloy Ni{sub 80}Fe{sub 20} (Py) films sputtered onto Cu(111) films with and without a graphene (Gr) interlayer grown by chemical vapor deposition before Py deposition. A two-angle sputtering method ensured that neither Gr nor Py was degraded by the sample preparation process. We find the expected damping enhancement from spin pumping for the Py/Cu case and no detectable enhancement for the Py/Gr/Cu case. Since damping is sensitive to effects other than spin pumping, we used magnetometry to verify that differences in Py magnetostatic properties are not responsible for the difference in damping. We attribute the suppression of spin pumping in Py/Gr/Cu to the large contact resistance of the Gr/Cu interface.
Authors:
; ; ; ;  [1]
  1. National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)
Publication Date:
OSTI Identifier:
22412863
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; Other Information: (c) 2015 U.S. Government; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHEMICAL VAPOR DEPOSITION; COMPARATIVE EVALUATIONS; COPPER; CRYSTAL STRUCTURE; DAMPING; FERROMAGNETIC RESONANCE; FILMS; GRAPHENE; INTERFACES; NICKEL BASE ALLOYS; PERMALLOY; PUMPING; SAMPLE PREPARATION; SPIN; SPUTTERING