Surface-induced cubic anisotropy in nanomagnets

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H. Kachkachi
Groupe d'Etude de la Matière Condensée, CNRS UMR8634, Université de Versailles St. Quentin, 45 av. des Etats-Unis, 78035 Versailles, France

E. Bonet
Laboratoire Louis Néel, CNRS, BP 166, 38042 Grenoble Cedex 9, France

Received 20 January 2006; revised 6 April 2006; published 2 June 2006

Weinvestigate the effect of surface anisotropy in a spherical many-spinmagnetic nanoparticle. By computing minor loops, two-dimensional (2D) and 3Denergyscape, and by investigating the behavior of the net magnetization,we show that in the case of a not toostrong surface anisotropy the behavior of the many-spin particle maybe modeled by that of a macrospin with an effectiveenergy containing uniaxial and cubic anisotropy terms. This holds forboth the transverse and Néel's surface anisotropy models.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.224402
DOI:	10.1103/PhysRevB.73.224402
PACS:	75.75.+a; 75.10.Hk 75.75.+a Magnetic properties of nanostructures 75.10.Hk Classical spin models (magnetism) YEAR: 2006
KEYWORDS:	nanoparticles, magnetic particles, magnetisation

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