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Highly asymmetric magnetic behavior in exchange biased systems induced by noncollinear field cooling

AutorJiménez, E.; Camarero, Julio; Sort, J.; Nogués, J.; Hoffmann, A.; Terán, F. J.; Perna, Paolo; García-Martín, José Miguel ; Dieny, Bernard; Miranda, Rodolfo
Palabras claveExchange bias
Magnetic anisotropy
Magnetic nanostructures
Fecha de publicación25-sep-2009
EditorAmerican Institute of Physics
CitaciónAppied Physics Letters 95, 2009
ResumenA detailed study of the angular dependence of the magnetization reversal in polycrystalline ferromagnetic (FM)/antiferromagnetic Co/IrMn bilayers with noncollinear FM and unidirectional anisotropies shows a peculiar asymmetric magnetic behavior. The anisotropy configuration is set via a field cooling (FC) procedure with the magnetic field misaligned with respect to the easy magnetization direction of the FM layer. Different magnetization reversal modes are observed for either positive or negative angles with respect to the FC direction. The angular dependence of both coercivity and exchange bias also clearly displays the broken symmetry of the induced noncollinearity. Our findings are reproduced with a modified Stoner–Wohlfarth model including the induced anisotropy configuration. Our results highlight the importance of the relative angle between anisotropies in exchange bias systems, opening a new path for the tailoring of their magnetic properties.
Versión del editorhttp://apl.aip.org/apl/copyright.jsp
http://dx.doi.org/10.1063/1.3236768
URIhttp://hdl.handle.net/10261/17229
DOI10.1063/1.3236768
ISSN0003-6951
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