Permanent magnetism in exchange-coupled nanocomposites

R. Skomski, J. P. Liu, D. J. Sellmyer

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

The magnetic properties of permanent magnetic nanocomposites are investigated both experimentally and by model calculations. Rare-earth transition-metal films and nanocomposite thin films containing a L10 hard phase (PtFe) have been prepared by plasma sputtering and heat treatment. By choosing suitable heat-treatment processes a nearly ideal nanostructure and high energy products of up to about 50 MGOe have been achieved for the Fe-Pt system. The behavior of the nanocomposites is discussed in terms of a model applicable to nearly ideal magnets, where there are no pronounced shoulders in the hysteresis loops. Analytic expressions for M(H) are obtained for a number of cases, and it is discussed how the loops depend on the micromagnetic parameters of the involved phases. A novel aspect of magnetic nanostructures is that very small magnetic grains exhibit very large energy products, even if they are intrinsically soft-magnetic.

Original languageEnglish (US)
Pages (from-to)309-320
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
Volume562
DOIs
StatePublished - Jan 1 1999
EventThe 1999 MRS Spring Meeting - Symposium L 'Polycrystalline Metal and Magnetic Thin Films' - San Francisco, Ca, USA
Duration: Apr 5 1998Apr 8 1998

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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