In this paper we present the behaviour of the magnetocrystalline anisotropy constants of [Co Pt ]6 multilayers as a function of temperature, ex-32A ternal magnetic field, and no xA n-magnetic layer thickness, observed by means of a torque magnetometer in an in-plane configuration. We have determined the magnetocrystalline anisotropy constants from the magnetic torque curves for different temperatures and in different magnetic fields, taking into account the angle difference between the directions of the external field and the magnetization. Among the results of this paper there are the determination of the critical thickness of Pt and the need to introduce the third order anisotropy constant in the analysis.
The lowest-energy geometric and isomers of freestanding Co n clusters ðn ¼ 2À10Þ and their corresponding magnetic moments have been studied using the Siesta code based on pseudopotential density-functional theory. The calculated results show that there are many isomers near the ground state. Di®erent isomers hold di®erent magnetic moment. The stability study shows that among the investigated clusters, the hexamer one is the most stable and is the magic cluster. Dissociation channels energy are also studied.
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