Cooperative magnetism and the Preisach model

R. Skomski, David J Sellmyer

Research output: Contribution to journalConference article

32 Citations (Scopus)

Abstract

Cooperative and noncooperative magnetization processes in magnetic nanostructures are investigated. Using model calculations it is shown that the Preisach model and related approaches, such as Henkel, ΔM, and ΔH plots, describe magnetism on a mean-field level and cannot account for intra- and inter-granular cooperative effects. For example, the ΔM plot of a nucleation-controlled two-domain particle gives the false impression of a positive intergranular interaction. A simple but nontrivial cooperative model, consisting of two interacting but nonequivalent particles, is used to show that cooperative effects are most pronounced for narrow switching-field distributions, i.e., for nearly rectangular loops. This is unfavorable from the point of magnetic recording, where one aims at combining narrow loops with a noncooperative local switching behavior. A general rule is that the neglect of cooperative effects leads to an overestimation of the coercivity.

Original languageEnglish (US)
Pages (from-to)7263-7265
Number of pages3
JournalJournal of Applied Physics
Volume89
Issue number11 II
DOIs
StatePublished - Jun 1 2001
Event8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States
Duration: Jan 7 2001Jan 11 2001

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plots
magnetic recording
coercivity
nucleation
magnetization
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Cooperative magnetism and the Preisach model. / Skomski, R.; Sellmyer, David J.

In: Journal of Applied Physics, Vol. 89, No. 11 II, 01.06.2001, p. 7263-7265.

Research output: Contribution to journalConference article

Skomski, R. ; Sellmyer, David J. / Cooperative magnetism and the Preisach model. In: Journal of Applied Physics. 2001 ; Vol. 89, No. 11 II. pp. 7263-7265.
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