Influence of external magnetic fields on the growth of alloy nanoclusters

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Author list: Einax M, Heinrichs S, Maass P, Majhofer A, Dieterich W

Publisher: IOP PUBLISHING LTD

Place: BRISTOL

Publication year: 2007

Journal acronym: J PHYS-CONDENS MAT

Volume number: 19

Issue number: 8

Number of pages: 8

ISSN: 0953-8984

Languages: English-Great Britain (EN-GB)

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Abstract

Kinetic Monte Carlo simulations are performed to study the influence of external magnetic fields on the growth of magnetic fcc binary alloy nanoclusters with perpendicular magnetic anisotropy. A model of the underlying kinetics is designed to describe the essential structural and magnetic properties of CoPt3-type clusters grown on a weakly interacting substrate through molecular beam epitaxy. The results suggest that perpendicular magnetic anisotropy can be enhanced when the field is applied during growth. For equilibrium bulk systems a significant shift of the onset temperature for L1(2) ordering is found, in agreement with predictions from Landau theory. Stronger field-induced effects can be expected for magnetic fcc alloys undergoing L1(0) ordering.

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