Magnetization reversals in elliptical permalloy particles

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We use the micromagnetic simulation to study the reversible and irreversible magnetization processes of the single-domain elliptical permalloy particles. The magnetization curve of the reversible process, which has no hysteresis, obtained by applying the field along the hard axis of the elliptical particle is almost linear, as is the case in the single-domain ellipsoidal particle. On the other hand, due to the occurrence of the nonuniform reversal, the switching field of the irreversible process, which has hysteresis, is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical particles are calculated as a function of ellipse's aspect ratio, and the function reveals a step-like behavior.

Original languageEnglish
Pages (from-to)2107-2109
Number of pages3
JournalIEEE Transactions on Magnetics
Volume40
Issue number4 II
DOIs
Publication statusPublished - 2004 Jul 1

Fingerprint

Magnetization reversal
Permalloys (trademark)
Hysteresis
Magnetization
magnetization
Aspect ratio
Nucleation
hysteresis
irreversible processes
ellipses
aspect ratio
nucleation
occurrences
rocks
curves
simulation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Wei, Z. H., Lai, M. F., Chang, C. R., Usov, N. A., Wu, J-C., & Lai, J. Y. (2004). Magnetization reversals in elliptical permalloy particles. IEEE Transactions on Magnetics, 40(4 II), 2107-2109. https://doi.org/10.1109/TMAG.2004.832252
Wei, Zung Hang ; Lai, Mei Feng ; Chang, Ching Ray ; Usov, N. A. ; Wu, Jong-Ching ; Lai, Jun Yang. / Magnetization reversals in elliptical permalloy particles. In: IEEE Transactions on Magnetics. 2004 ; Vol. 40, No. 4 II. pp. 2107-2109.
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Wei, ZH, Lai, MF, Chang, CR, Usov, NA, Wu, J-C & Lai, JY 2004, 'Magnetization reversals in elliptical permalloy particles', IEEE Transactions on Magnetics, vol. 40, no. 4 II, pp. 2107-2109. https://doi.org/10.1109/TMAG.2004.832252

Magnetization reversals in elliptical permalloy particles. / Wei, Zung Hang; Lai, Mei Feng; Chang, Ching Ray; Usov, N. A.; Wu, Jong-Ching; Lai, Jun Yang.

In: IEEE Transactions on Magnetics, Vol. 40, No. 4 II, 01.07.2004, p. 2107-2109.

Research output: Contribution to journalArticle

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AU - Wei, Zung Hang

AU - Lai, Mei Feng

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AB - We use the micromagnetic simulation to study the reversible and irreversible magnetization processes of the single-domain elliptical permalloy particles. The magnetization curve of the reversible process, which has no hysteresis, obtained by applying the field along the hard axis of the elliptical particle is almost linear, as is the case in the single-domain ellipsoidal particle. On the other hand, due to the occurrence of the nonuniform reversal, the switching field of the irreversible process, which has hysteresis, is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical particles are calculated as a function of ellipse's aspect ratio, and the function reveals a step-like behavior.

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