Hysteresis of granular FePt:Ag films with perpendicular anisotropy

M. L. Yan, R. Skomski, A. Kashyap, L. Gao, Sy-Hwang Liou, David J Sellmyer

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Intergranular interactions in nanostructured FePt:Ag thin films and their effect on magnetic hysteresis are investigated. The films, produced by multilayer deposition plus rapid thermal annealing, consist of FePt nanoparticles embedded in a silver matrix. They are investigated by magnetization measurements and magnetic force microscopy. Analytical model calculations, supported by micromagnetic simulations, are used to elucidate the relation between coercivity, hysteresis-loop slope, and spatial correlations during magnetization reversal. The analytical calculations yield simple expressions for the loop slope and the coercivity as a function of the intergranular exchange. Small intergranular exchange enhances the coercivity, but for strong exchange there is a self-energy cutoff, associated with the onset of cooperative reversal and preventing alpha from becoming negative.

Original languageEnglish (US)
Pages (from-to)2495-2497
Number of pages3
JournalIEEE Transactions on Magnetics
Volume40
Issue number4 II
DOIs
StatePublished - Jul 1 2004

Fingerprint

Coercive force
coercivity
Hysteresis
Anisotropy
hysteresis
anisotropy
slopes
Magnetic force microscopy
Magnetization reversal
Magnetic hysteresis
magnetization
magnetic force microscopy
Rapid thermal annealing
Hysteresis loops
Silver
Analytical models
Magnetization
Multilayers
cut-off
silver

Keywords

  • Anisotropy
  • Magnetic recording
  • Magnetization reversal

ASJC Scopus subject areas

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

Cite this

Hysteresis of granular FePt:Ag films with perpendicular anisotropy. / Yan, M. L.; Skomski, R.; Kashyap, A.; Gao, L.; Liou, Sy-Hwang; Sellmyer, David J.

In: IEEE Transactions on Magnetics, Vol. 40, No. 4 II, 01.07.2004, p. 2495-2497.

Research output: Contribution to journalArticle

Yan, M. L. ; Skomski, R. ; Kashyap, A. ; Gao, L. ; Liou, Sy-Hwang ; Sellmyer, David J. / Hysteresis of granular FePt:Ag films with perpendicular anisotropy. In: IEEE Transactions on Magnetics. 2004 ; Vol. 40, No. 4 II. pp. 2495-2497.
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