Role of anisotropy configuration in exchange-biased systems
Jiménez, E. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)
Camarero, Julio (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)
Perna, Paolo (Instituto Madrileño de Estudios Avanzados en Nanociencia)
Mikuszeit, F. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)
Teran, F. J. (Instituto Madrileño de Estudios Avanzados en Nanociencia)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
García-Martín, J. M. (Instituto de Microelectrónica de Madrid)
Hoffmann, Axel (Argonne National Laboratory. Materials Science Division)
Dieny, B. (SPINTEC (Spin Electronics Research))
Miranda, R. (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada)

Date:	2011
Abstract:	We 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 bFC 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 bFC =0º 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.
Grants:	Ministerio de Ciencia e Innovación MAT2010-20616-C02-02 Ministerio de Ciencia e Innovación MAT2010-22822 Ministerio de Ciencia e Innovación CSD2007-00010 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1292
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Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Matèria condensada
Published in:	Journal of applied physics, Vol. 109, Núm. 7 (April 2011) , p. 07D730/1-07D730/3, ISSN 1089-7550

DOI: 10.1063/1.3562507

3 p, 1.0 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
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Articles > Published articles