Imprinting Vortices into Antiferromagnets
Sort, J. (Institució Catalana de Recerca i Estudis Avançats (ICREA))
Buchanan, K. S. (Argonne National Laboratory. Materials Science Division and Center for Nanoscale Materials)
Novosad, V. (Argonne National Laboratory. Materials Science Division and Center for Nanoscale Materials)
Hoffmann, A. (Argonne National Laboratory. Materials Science Division and Center for Nanoscale Materials)
Salazar-Alvarez, G. (Universitat Autònoma de Barcelona. Departament de Física)
Bollero, A. (SPINTEC (Spin Electronics Research))
Baró, M.D. (Universitat Autònoma de Barcelona. Departament de Física)
Dieny, B. (SPINTEC (Spin Electronics Research))
Nogués, J. (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2006
Abstract:	The effect of imprinting symmetric and displaced vortex structures into an antiferromagnetic material is investigated in micron-sized disks consisting of exchange coupled ferromagnetic-antiferromagnetic bilayers. The imprint of displaced vortices manifests itself by the occurrence of a new type of asymmetric hysteresis loops characterized by curved, reversible, central sections with nonzero remanent magnetization. Such an imprint is achieved by cooling the disks through the blocking temperature of the system in small fields. Micromagnetic simulations reveal that asymmetric vortexlike loops naturally result from the competition between the different energies involved in the system.
Note:	Premi a l'excel·lència investigadora. Àmbit de les Ciències Tecnològiques. 2008
Rights:	Tots els drets reservats
Form:	article ; publishedVersion
Subject:	PREI2008
Published in:	Physical Review Letters, Vol. 97, Núm. 6 (August 2006) , p. 1-4, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.97.067201

4 p, 1.2 MB

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