Magnetization reversal in exchange biased IrMn/Fe ring arrays

Yu Feng Hou; Qing Feng Zhan; Kannan M. Krishnan

doi:10.1063/1.3549187

Magnetization reversal in exchange biased IrMn/Fe ring arrays

Yu Feng Hou, Qing Feng Zhan, Kannan M. Krishnan

University of Washington

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

4 Scopus citations

Abstract

We investigated the effect of exchange bias on the magnetization reversal behavior in ring-shaped IrMn/Fe lithographic structures. The magnetic anisotropy geometry of the exchange biased ring is revealed by fitting for the angular dependence of the exchange bias, H_eb, and coercivity, H_c. Magnetic force microscopy images obtained at different field values along the hysteresis loop show that along the bias direction, the ring exhibits a magnetic reversal via nonuniform domain nucleation while perpendicular to the bias direction, the magnetic reversal occurs via coherent rotation. The difference in magnetic switching modes for these two field orientations is confirmed by micromagnetic simulations and interpreted by the effective field model.

Original language	English
Article number	042510
Journal	Applied Physics Letters
Volume	98
Issue number	4
DOIs	https://doi.org/10.1063/1.3549187
State	Published - 24 Jan 2011
Externally published	Yes

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title = "Magnetization reversal in exchange biased IrMn/Fe ring arrays",

abstract = "We investigated the effect of exchange bias on the magnetization reversal behavior in ring-shaped IrMn/Fe lithographic structures. The magnetic anisotropy geometry of the exchange biased ring is revealed by fitting for the angular dependence of the exchange bias, Heb, and coercivity, Hc. Magnetic force microscopy images obtained at different field values along the hysteresis loop show that along the bias direction, the ring exhibits a magnetic reversal via nonuniform domain nucleation while perpendicular to the bias direction, the magnetic reversal occurs via coherent rotation. The difference in magnetic switching modes for these two field orientations is confirmed by micromagnetic simulations and interpreted by the effective field model.",

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AU - Hou, Yu Feng

AU - Zhan, Qing Feng

AU - Krishnan, Kannan M.

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N2 - We investigated the effect of exchange bias on the magnetization reversal behavior in ring-shaped IrMn/Fe lithographic structures. The magnetic anisotropy geometry of the exchange biased ring is revealed by fitting for the angular dependence of the exchange bias, Heb, and coercivity, Hc. Magnetic force microscopy images obtained at different field values along the hysteresis loop show that along the bias direction, the ring exhibits a magnetic reversal via nonuniform domain nucleation while perpendicular to the bias direction, the magnetic reversal occurs via coherent rotation. The difference in magnetic switching modes for these two field orientations is confirmed by micromagnetic simulations and interpreted by the effective field model.

AB - We investigated the effect of exchange bias on the magnetization reversal behavior in ring-shaped IrMn/Fe lithographic structures. The magnetic anisotropy geometry of the exchange biased ring is revealed by fitting for the angular dependence of the exchange bias, Heb, and coercivity, Hc. Magnetic force microscopy images obtained at different field values along the hysteresis loop show that along the bias direction, the ring exhibits a magnetic reversal via nonuniform domain nucleation while perpendicular to the bias direction, the magnetic reversal occurs via coherent rotation. The difference in magnetic switching modes for these two field orientations is confirmed by micromagnetic simulations and interpreted by the effective field model.

UR - https://www.scopus.com/pages/publications/79551638818

U2 - 10.1063/1.3549187

DO - 10.1063/1.3549187

M3 - 文章

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SN - 0003-6951

VL - 98

JO - Applied Physics Letters

JF - Applied Physics Letters

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Magnetization reversal in exchange biased IrMn/Fe ring arrays

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