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Role of anisotropy configuration in exchange-biased systems

AuthorsJiménez, E.; Camarero, Julio; Perna, Paolo; Mikuszeit, N.; Terán, F. J.; Sort, J.; Nogués, J.; García-Martín, José Miguel ; Hoffmann, A.; Dieny, Bernard; Miranda, Rodolfo
KeywordsAntiferromagnetic materials
Coercive force
Ferromagnetic materials
Magnetic anisotropy
Magnetic multilayers
magnetisation reversal
Issue Date5-Apr-2011
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 109(7): 07D730 (2011)
AbstractWe present a systematic study of the anisotropy configuration effects on the magnetic properties of exchange-biased ferromagnetic/antiferromagnetic (FM/AFM) Co/IrMn bilayers. The interfacial unidirectional anisotropy is set extrinsically via a field cooling procedure with the magnetic field misaligned by an angle βFC with respect to the intrinsic FM uniaxial anisotropy. High resolution angular dependence in-plane resolved Kerr magnetometry measurements have been performed for three different anisotropy arrangements, including collinear βFC = 0∘ and two opposite noncollinear cases. The symmetry breaking of the induced noncollinear configurations results in a peculiar nonsymmetric magnetic behavior of the angular dependence of magnetization reversal, coercivity, and exchange bias. The experimental results are well reproduced without any fitting parameter by using a simple model including the induced anisotropy configuration. Our finding highlights the importance of the relative angle between anisotropies in order to properly account for the magnetic properties of exchange-biased FM/AFM systems.
Publisher version (URL)http://dx.doi.org/10.1063/1.3562507
Appears in Collections:(IMN-CNM) Artículos
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