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1 Materials Science Poland

1 2008

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Pseudodipolar model of surface magnetostriction for thin layers with roughness

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Szumiata T. , Gzik-Szumiata M. , Brzózka K.

Materials Science Poland

2008

tom Vol. 26, No. 4

1039--1044

An effective magnetostriction model for monocrystalline thin films of cubic structure has been presented. The film roughness was simulated by cubicoidal steps on surface repeated in the plane with a constant period. In order to describe a magnetoelastic energy, a pseudodipolar spin–spin interaction was considered. Lattice summations of strain dependent energy contribution were performed symbolically. A significant difference of magnetoelastic energy compared with the film interior was observed only in the first atomic layer at the surface. An effective pseudodipolar magnetostriction constant λ eff for rough film was determined by estimating the volume of surface region and considering the magnetostriction data for bulk material. Thickness dependence of λ eff for bcc Fe film has been presented and compared with magnetic dipolar contribution.