Modeling of Magnetic Hyperfine Field Distribution for Spherical Nanoparticles of bcc Structure

Abstract

We propose a simple model for temperature evolution of magnetic hyperfine field distribution of spherical bcc Fe nanoparticles. We performed mean field approximation calculations of mean spin value in each spherical shell of nanoparticle. Considering magnetic hyperfine field values reported for iron thin films we predicted possible values of hyperfine fields in the internal and surface region of the particles as a function of temperature.

Surface Magnetostriction Model for MagNEMS

“…Magnetostriction changes, due to the presence of surface roughness (Fig. 1) of magnetostrictive layer, has been considered in model developed in [6]. The following formulae:…”

“…Within pseudodipolar exchange interactions model for bcc crystalline structure [6] a surface magnetostriction constant is equal …”

Model of Anisotropic Electrical Resistivity in Rough Thin Films

“…Surface roughness influences not only electrical conductivity but also other physical properties e.g. surface magnetostriction [3]. In this work a new model of electrical resistivity is developed in order to predict the dependence of thin films resistivity on geometrical parameters of surface roughness.…”