Surface-induced cubic anisotropy in nanomagnets

Surface-induced cubic anisotropy in nanomagnets

– We investigate the effects of surface anisotropy in a spherical magnetic nanoparticle. By computing minor loops, 2D and 3D energyscape, and by investigating the behaviour of the net magnetisation, we show that the behaviour of a many-spin particle is modeled by a macro-spin effective energy containing a uniaxial and cubic anisotropy terms. Introduction. – A magnetic nanoparticle exhibits many...

Effective anisotropy of thin nanomagnets: Beyond the surface-anisotropy approach

Jean-Guy Caputo,1,2 Yuri Gaididei,3 Volodymyr P. Kravchuk,4 Franz G. Mertens,5 and Denis D. Sheka4,* 1Laboratoire de Mathématiques, INSA de Rouen, Boîte Postale 8, 76131 Mont-Saint-Aignan Cedex, France 2Laboratoire de Physique Theorique et Modelisation, Université de Cergy-Pontoise and CNRS, Cergy-Pontoise 95011, France 3Institute for Theoretical Physics, 03143 Kiev, Ukraine 4National Taras She...

Magnetic Anisotropy of Molecular Nanomagnets

Breaking the configurational anisotropy in Fe single crystal nanomagnets

Numerical transfer-matrix study of surface-tension anisotropy in Ising models on square and cubic lattices.

We compute by numerical transfer-matrix methods the surface free energy τ(T ), the surface stiffness coefficient κ(T ), and the single-step free energy s(T ) for Ising ferromagnets with (∞×L) square-lattice and (∞×L×M) cubic-lattice geometries, into which an interface is introduced by imposing antiperiodic or plus/minus boundary conditions in one transverse direction. The surface tension σ(θ, T...