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Title: Annealing influence on the Gilbert damping parameter and the exchange constant of CoFeB thin films

We present a study of the influence of the annealing temperature T{sub a} on the magnetic properties of Co{sub 40}Fe{sub 40}B{sub 20} thin films. Using a vector network analyzer ferromagnetic resonance (VNA-FMR) setup and the magneto-optical Kerr effect, the dependence of the Gilbert damping parameter α, the exchange constant A, the saturation magnetization as well as the coercive field and the Kerr signal on T{sub a} is reported. Additionally, the correlation with the crystalline properties of the films studied by X-ray diffractometry is discussed. We found that while the damping parameter α and the coercive field show sharp changes starting at a certain T{sub a} value, the exchange constant A and the Kerr signal show a steady evolution. A differential modification of the film surface compared to the bulk is discussed as a possible reason. In any case, we found that the low damping values are preserved at the first onset of crystallization.
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern (Germany)
  2. Institut für Oberflächen- und Schichtanalytik GmbH (IFOS) and Landesforschungszentrum OPTIMAS, Trippstadter Str. 120, 67663 Kaiserslautern (Germany)
Publication Date:
OSTI Identifier:
22269179
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; CRYSTALLIZATION; DAMPING; FERROMAGNETIC RESONANCE; KERR EFFECT; MAGNETIC PROPERTIES; MAGNETIZATION; THIN FILMS; X-RAY DIFFRACTION