Permanent magnetism in exchange-coupled nanocomposites

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

Research output: Contribution to journalConference article

6 Citations (Scopus)

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)335-346
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
Volume577
StatePublished - Dec 1 1999
EventProceedings of the 1999 MRS Spring Meeting - Symposium H: Advanced Hard Magnets-Principles, Materials, and Processing - Symposium I: Amorphous and Nanocrystalline Materials for Hard and Soft Magnetic Applications - San Francisco, CA, USA
Duration: Apr 5 1998Apr 8 1998

Fingerprint

Magnetism
Nanostructures
Nanocomposites
nanocomposites
Heat treatment
Nanocomposite films
heat treatment
Hysteresis loops
Rare earths
Transition metals
Magnets
Sputtering
Magnetic properties
products
shoulders
Plasmas
metal films
Thin films
magnets
rare earth elements

ASJC Scopus subject areas

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

Cite this

Permanent magnetism in exchange-coupled nanocomposites. / Skomski, R.; Liu, J. P.; Sellmyer, David J.

In: Materials Research Society Symposium - Proceedings, Vol. 577, 01.12.1999, p. 335-346.

Research output: Contribution to journalConference article

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