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

Research output: Contribution to journalConference 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 languageEnglish
Pages (from-to)135-138
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume282
Issue number1-3
DOIs
Publication statusPublished - 2004 Nov 1
EventInternational Symposium on Advanced Magnetic Technologies - Taipei, Taiwan
Duration: 2003 Nov 132003 Nov 16

Fingerprint

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

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Lai, Mei Feng ; Wei, Zung Hang ; Chang, Ching Ray ; Usov, N. A. ; Wu, Jong-Ching ; Lai, Jun Yang. / Nonuniform magnetization reversals in elliptical permalloy dots. In: Journal of Magnetism and Magnetic Materials. 2004 ; Vol. 282, No. 1-3. pp. 135-138.
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Nonuniform magnetization reversals in elliptical permalloy dots. / Lai, Mei Feng; Wei, Zung Hang; Chang, Ching Ray; Usov, N. A.; Wu, Jong-Ching; Lai, Jun Yang.

In: Journal of Magnetism and Magnetic Materials, Vol. 282, No. 1-3, 01.11.2004, p. 135-138.

Research output: Contribution to journalConference article

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T1 - Nonuniform magnetization reversals in elliptical permalloy dots

AU - Lai, Mei Feng

AU - Wei, Zung Hang

AU - Chang, Ching Ray

AU - Usov, N. A.

AU - Wu, Jong-Ching

AU - Lai, Jun Yang

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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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