Controlling magnetic vortices through exchange bias
Sort Viñas, Jordi (Institució Catalana de Recerca i Estudis Avançats)
Salazar Álvarez, Germán (Universitat Autònoma de Barcelona. Departament de Física)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Dieny, B. (SPINTEC (Spin Electronics Research))
Hoffmann, Axel (Argonne National Laboratory. Materials Science Division)
Novosad, V. (Argonne National Laboratory. Materials Science Division)
Nogués, Josep (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Data:	2006
Resum:	The magnetization reversal in Permalloy (Py) and Py-IrMn disks (1μm diameter) is investigated. The Py disks reverse their magnetization via vortex state formation. Conversely, if the Py-IrMn disks are field cooled from above the blocking temperatureTB, a critical angle with respect to the cooling direction is set, beyond which the vortex no longer nucleates. This angle can be experimentally tuned by varying the magnitude of the exchange bias field. Furthermore, the coupling with IrMn can also induce an enhancement of the vortex stability when the disks are zero-field cooled from above TB.
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Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Exchange interactions ; Nucleation ; Magnetization reversals ; Atomic force microscopy ; Magnetic fields ; Magnetic hysteresis ; Temperature measurement ; Magnetotransport effects ; Thermomagnetic effects ; Vortex stability
Publicat a:	Applied physics letters, Vol. 88, Issue 4 (January 2006) , p. 042502/1-042502/3, ISSN 1077-3118

DOI: 10.1063/1.2165290

4 p, 246.2 KB

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