MAGNETIZATION REVERSAL IN THIN MAGNETIC FILMS WITH PERPENDICULAR ANISOTROPY.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A one-dimensional theory of magnetization reversal in thin, perpendicularly anisotropic magnetic films is presented. It is postulated that the presence of a defective point creates an infinitely deep, infinitely narrow potential well which inhibits the rotation of local magnetization. The interval D between neighboring defects, the saturation magnetization M//s, the anisotropy constant K//u, and the exchange energy constant A are assumed to be finite and uniform across the film. Starting with an initial state where the film is uniformly magnetized to saturation in the easy direction, we show that a discontinuous change of state occurs when the reverse external field H reaches a critical value H//c. The domains thus nucleated at the critical field expand to cover the entire area of the film as H increases beyond H//c. Using the normalized values of H and D, defined, respectively, as h equals H/(2K//u/M//s) and d equals D/(4A/K//u)**1**/**2, it is shown that the critical field h//c is a function only of d and that its value decreases significantly as d increases.

Original languageEnglish (US)
Pages (from-to)1660-1663
Number of pages4
JournalJournal of Applied Physics
Volume53
Issue number3 pt 1
DOIs
StatePublished - Mar 1982
Externally publishedYes

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magnetic films
magnetization
anisotropy
saturation
energy transfer
intervals
defects

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

MAGNETIZATION REVERSAL IN THIN MAGNETIC FILMS WITH PERPENDICULAR ANISOTROPY. / Mansuripur, Masud.

In: Journal of Applied Physics, Vol. 53, No. 3 pt 1, 03.1982, p. 1660-1663.

Research output: Contribution to journalArticle

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abstract = "A one-dimensional theory of magnetization reversal in thin, perpendicularly anisotropic magnetic films is presented. It is postulated that the presence of a defective point creates an infinitely deep, infinitely narrow potential well which inhibits the rotation of local magnetization. The interval D between neighboring defects, the saturation magnetization M//s, the anisotropy constant K//u, and the exchange energy constant A are assumed to be finite and uniform across the film. Starting with an initial state where the film is uniformly magnetized to saturation in the easy direction, we show that a discontinuous change of state occurs when the reverse external field H reaches a critical value H//c. The domains thus nucleated at the critical field expand to cover the entire area of the film as H increases beyond H//c. Using the normalized values of H and D, defined, respectively, as h equals H/(2K//u/M//s) and d equals D/(4A/K//u)**1**/**2, it is shown that the critical field h//c is a function only of d and that its value decreases significantly as d increases.",
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