Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 323, Issue 3-4, Pages 346-350Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2010.09.037
Keywords
Ferromagnetic resonance; Magnetic properties of thin film; Magnetic anisotropy; Exchange bias
Funding
- DPT (State Planning Organization of Turkey) [2009K120730]
- TUBITAK [209T061]
- DFG [SFB491]
- Marmara University [FEN-KPS-100105-0073]
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Exchange-biased CoO/Fe bilayer grown on MgO (0 0 1) substrate by sputtering, studied by variable angle and temperature ferromagnetic resonance. Room temperature in-plane measurements reveal that the Fe layer was epitaxially grown on MgO substrate with a fourfold cubic symmetry. The data also show that the easy axis of magnetization is in the film plane and makes an angle of 45 degrees with the [1 0 0] crystallographic direction of MgO substrate. The low temperature data exhibit a sudden onset of a field cooling-induced and shifted cubic anisotropy below the Neel temperature of CoO. This results in a two fold uniaxial or fourfold cubic symmetry for in-plane magnetic anisotropy depending on a field cooling direction. Low temperature measurements also present a reduction in the resonance fields due to the antiferromagnetic/ferromagnetic coupling. The developed theoretical model perfectly simulates the experimental data of coupled CoO/Fe bilayer. (C) 2010 Elsevier B.V. All rights reserved.
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