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Title: Influence of controlled surface oxidation on the magnetic anisotropy of Co ultrathin films

We studied the influence of controlled surface-limited oxidation of electrodeposited epitaxial Co(0001)/Au(111) films on their magnetic anisotropy energy using real time in situ magneto optical Kerr effect and density functional theory (DFT) calculations. We investigated the Co first electrochemical oxidation step which we demonstrate to be completely reversible and determined the structure of this oxide layer. We show that the interface magnetic anisotropy of the Co film increases by 0.36 erg/cm{sup 2} upon Co surface oxidation. We performed DFT calculations to determine the different surface structures in a wide potential range as well as the charge transfer at the Co surface. Our results suggest that the magnetic anisotropy change is correlated with a positive charge increase of 0.54 e{sup −} for the Co surface atom upon oxidation.
Authors:
; ;  [1] ; ; ;  [2]
  1. Physique de la Matière Condensée, Ecole Polytechnique, CNRS, 91128 Palaiseau (France)
  2. School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)
Publication Date:
OSTI Identifier:
22398778
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 12; Other Information: (c) 2015 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; ANISOTROPY; ATOMS; COPPER; CRYSTAL STRUCTURE; DENSITY FUNCTIONAL METHOD; ELECTROCHEMISTRY; ELECTRODEPOSITION; EPITAXY; GOLD; INTERFACES; KERR EFFECT; LAYERS; MAGNETO-OPTICAL EFFECTS; OXIDATION; POTENTIALS; SURFACES; THIN FILMS