Permanent magnetism in exchange-coupled nanocomposites

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

doi:10.1557/proc-562-309

Permanent magnetism in exchange-coupled nanocomposites

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

Physics and Astronomy

Research output: Contribution to journal › Conference article › peer-review

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 language	English (US)
Pages (from-to)	309-320
Number of pages	12
Journal	Materials Research Society Symposium - Proceedings
Volume	562
DOIs	https://doi.org/10.1557/proc-562-309
State	Published - 1999
Event	The 1999 MRS Spring Meeting - Symposium L 'Polycrystalline Metal and Magnetic Thin Films' - San Francisco, Ca, USA Duration: Apr 5 1998 → Apr 8 1998

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Permanent magnetism in exchange-coupled nanocomposites",

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.",

author = "R. Skomski and Liu, {J. P.} and Sellmyer, {D. J.}",

year = "1999",

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TY - JOUR

T1 - Permanent magnetism in exchange-coupled nanocomposites

AU - Skomski, R.

AU - Liu, J. P.

AU - Sellmyer, D. J.

PY - 1999

Y1 - 1999

N2 - 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.

AB - 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.

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JF - Materials Research Society Symposium - Proceedings

T2 - The 1999 MRS Spring Meeting - Symposium L 'Polycrystalline Metal and Magnetic Thin Films'

Y2 - 5 April 1998 through 8 April 1998

ER -

Permanent magnetism in exchange-coupled nanocomposites

Abstract

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