Energetics of domain formation in thermomagnetic recording

M. Mansuripur, G. A.N. Connell

Research output: Contribution to journalArticle

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Abstract

A new model for the distribution of perpendicular magnetization in thin magnetic films supporting a circular domain is proposed. The contributions of various sources to the magnetic energy are determined and the demagnetizing effect in particular is discussed at length. It is shown that a demagnetizing energy density per unit area of the domain wall can be defined which, unlike the domain wall energy density arising from exchange and anisotropy contributions, is a function of film thickness h. For domains of large radius and small wall thickness (compared with h), the demagnetizing energy density is found to be linearly increasing with h. A typical cycle of thermomagnetic recording on a thin ferrimagnetic film with room temperature compensation point is then studied, and the effect of various parameters on the formation process and stability of reverse magnetized domains is discussed.

Original languageEnglish (US)
Pages (from-to)3049-3055
Number of pages7
JournalJournal of Applied Physics
Volume55
Issue number8
DOIs
StatePublished - Dec 1 1984

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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