Nonuniform magnetization reversals in elliptical permalloy dots

Mei Feng Lai; Zung Hang Wei; Ching Ray Chang; N. A. Usov; Jong-Ching Wu; Jun Yang Lai

doi:10.1016/j.jmmm.2004.04.032

Nonuniform magnetization reversals in elliptical permalloy dots

Mei Feng Lai, Zung Hang Wei, Ching Ray Chang, N. A. Usov, Jong-Ching Wu, Jun Yang Lai

Department of Physics

Research output: Contribution to journal › Conference article

3 Citations (Scopus)

Abstract

Reversible and irreversible magnetization processes of the single-domain elliptical permalloy dot are studied by simulation. The magnetization curve of the reversible process obtained by applying the field along the hard axis of the elliptical dot is almost linear, as is the case in the single-domain ellipsoidal particle. Due to the occurrence of the non uniform reversal, the switching field is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical dots are calculated as a function of ellipse's aspect ratio, and the function reveals a step-like behavior.

Original language	English
Pages (from-to)	135-138
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	282
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jmmm.2004.04.032
Publication status	Published - 2004 Nov 1
Event	International Symposium on Advanced Magnetic Technologies - Taipei, Taiwan Duration: 2003 Nov 13 → 2003 Nov 16

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

Lai, M. F., Wei, Z. H., Chang, C. R., Usov, N. A., Wu, J-C., & Lai, J. Y. (2004). Nonuniform magnetization reversals in elliptical permalloy dots. Journal of Magnetism and Magnetic Materials, 282(1-3), 135-138. https://doi.org/10.1016/j.jmmm.2004.04.032

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abstract = "Reversible and irreversible magnetization processes of the single-domain elliptical permalloy dot are studied by simulation. The magnetization curve of the reversible process obtained by applying the field along the hard axis of the elliptical dot is almost linear, as is the case in the single-domain ellipsoidal particle. Due to the occurrence of the non uniform reversal, the switching field is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical dots are calculated as a function of ellipse's aspect ratio, and the function reveals a step-like behavior.",

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AU - Lai, Mei Feng

AU - Wei, Zung Hang

AU - Chang, Ching Ray

AU - Usov, N. A.

AU - Wu, Jong-Ching

AU - Lai, Jun Yang

PY - 2004/11/1

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N2 - Reversible and irreversible magnetization processes of the single-domain elliptical permalloy dot are studied by simulation. The magnetization curve of the reversible process obtained by applying the field along the hard axis of the elliptical dot is almost linear, as is the case in the single-domain ellipsoidal particle. Due to the occurrence of the non uniform reversal, the switching field is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical dots are calculated as a function of ellipse's aspect ratio, and the function reveals a step-like behavior.

AB - Reversible and irreversible magnetization processes of the single-domain elliptical permalloy dot are studied by simulation. The magnetization curve of the reversible process obtained by applying the field along the hard axis of the elliptical dot is almost linear, as is the case in the single-domain ellipsoidal particle. Due to the occurrence of the non uniform reversal, the switching field is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical dots are calculated as a function of ellipse's aspect ratio, and the function reveals a step-like behavior.

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10.1016/j.jmmm.2004.04.032