Controlling magnetic vortices through exchange bias

J. Sort; G. Salazar-Alvarez; M. D. Baró; B. Dieny; A. Hoffmann; V. Novosad; J. Nogús

doi:10.1063/1.2165290

Controlling magnetic vortices through exchange bias

J. Sort, G. Salazar-Alvarez, M. D. Baró, B. Dieny, A. Hoffmann, V. Novosad, J. Nogús

Research output: Contribution to journal › Article › peer-review

Abstract

The magnetization reversal in Permalloy (Py) and Py-IrMn disks (1 μm 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 temperature TB, 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.

Original language	English (US)
Article number	042502
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	88
Issue number	4
DOIs	https://doi.org/10.1063/1.2165290
State	Published - 2006
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2165290

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title = "Controlling magnetic vortices through exchange bias",

abstract = "The magnetization reversal in Permalloy (Py) and Py-IrMn disks (1 μm 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 temperature TB, 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.",

author = "J. Sort and G. Salazar-Alvarez and Bar{\'o}, {M. D.} and B. Dieny and A. Hoffmann and V. Novosad and J. Nog{\'u}s",

note = "Funding Information: Financial support from the NEXBIAS (HPRN-CT 2002-00296), the 2005SGR-00401, the MAT-2004-01679 research projects and the Institut Catal{\`a} de Nanotecnologia (ICN) is acknowledged. Work at Argonne was supported by the U.S. Department of Energy, under Contract No. W-31-109-ENG-38. One of the authors (G.S.A.) acknowledges the financial support from the NEXBIAS research network.",

year = "2006",

doi = "10.1063/1.2165290",

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AU - Sort, J.

AU - Salazar-Alvarez, G.

AU - Baró, M. D.

AU - Dieny, B.

AU - Hoffmann, A.

AU - Novosad, V.

AU - Nogús, J.

N1 - Funding Information: Financial support from the NEXBIAS (HPRN-CT 2002-00296), the 2005SGR-00401, the MAT-2004-01679 research projects and the Institut Català de Nanotecnologia (ICN) is acknowledged. Work at Argonne was supported by the U.S. Department of Energy, under Contract No. W-31-109-ENG-38. One of the authors (G.S.A.) acknowledges the financial support from the NEXBIAS research network.

PY - 2006

Y1 - 2006

N2 - The magnetization reversal in Permalloy (Py) and Py-IrMn disks (1 μm 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 temperature TB, 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.

AB - The magnetization reversal in Permalloy (Py) and Py-IrMn disks (1 μm 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 temperature TB, 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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Controlling magnetic vortices through exchange bias

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