Origin of the asymmetric magnetization reversal behavior in exchange-biased systems : competing anisotropies
Camarero, Julio (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)
Sort Viñas, Jordi (Centre National de la Recherche Scientifique (França))
Hoffmann, Axel (Argonne National Laboratory. Materials Science Division)
Garcia Martín, José Miguel (Instituto de Microelectrónica de Madrid)
Dieny, B. (Centre National de la Recherche Scientifique (França))
Miranda, Rodolfo (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)
Nogués, Josep (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Data:	2005
Resum:	The magnetization reversal in exchange-biased ferromagnetic-antiferromagnetic (FM-AFM) bilayers is investigated. Different reversal pathways on each branch of the hysteresis loop, i. e. , asymmetry, are obtained both experimentally and theoretically when the magnetic field is applied at certain angles from the anisotropy direction. The range of angles and the magnitude of this asymmetry are determined by the ratio between the FM anisotropy and the interfacial FM-AFM exchange anisotropy. The occurrence of asymmetry is linked with the appearance of irreversibility, i. e. , finite coercivity, as well as with the maximum of exchange bias, increasing for larger anisotropy ratios. Our results indicate that asymmetric hysteresis loops are intrinsic to exchange-biased systems and the competition between anisotropies determines the asymmetric behavior of the magnetization reversal.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; Versió publicada
Publicat a:	Physical review letters, Vol. 95, Issue 5 (July 2005) , p. 057204, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.95.057204

4 p, 4.2 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Grup de nanoenginyeria de materials, nanomagnetisme i nanomecànica (Gnm3)
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