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Title: Field-dependent perpendicular magnetic anisotropy in CoFeB thin films

We report ferromagnetic resonance measurements of perpendicular magnetic anisotropy in thin films of Ta/Co{sub 20}Fe{sub 60}B{sub 20}/MgO as a function of the Co{sub 20}Fe{sub 60}B{sub 20} layer thickness. The first and second order anisotropy terms show unexpectedly strong dependence on the external magnetic field applied to the system during the measurements. We propose strong interfacial spin pinning as a possible origin of the field-dependent anisotropy. Our results imply that high-field anisotropy measurements cannot be directly used for quantitative evaluation of zero-field performance parameters of CoFeB-based devices such as spin torque memory.
Authors:
;  [1] ;  [2] ;  [3] ; ;  [1] ;  [4] ; ;  [5] ;  [6]
  1. Physics and Astronomy, University of California, Irvine, California 92697 (United States)
  2. INAC/CEA, Grenoble, 17 avenue des Martyrs, Grenoble 38054 (France)
  3. (CeNIDE), Universität Duisburg-Essen, Duisburg 47048 (Germany)
  4. (Brazil)
  5. Fakultät für Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, Duisburg 47048 (Germany)
  6. Departamento de Física, FCFM, Universidad de Chile, Casilla 487-3, Santiago (Chile)
Publication Date:
OSTI Identifier:
22350902
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 15; 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; ANISOTROPY; BORON COMPOUNDS; COBALT COMPOUNDS; FERROMAGNETIC RESONANCE; IRON COMPOUNDS; LAYERS; MAGNESIUM OXIDES; MAGNETIC FIELDS; SPIN; TANTALUM; THICKNESS; THIN FILMS; TORQUE