Micromagnetic analysis of magnetization reversal in Fe77.5Si7.5B15 amorphous glass-coated nanowires

Abstract

A micromagnetic model based on the finite element method (FEM) is proposed in order to investigate the specific role of the magnetoelastic anisotropy in the axial magnetization reversal process of highly magnetostrictive amorphous glass-coated nanowires with cylindrical symmetry, prepared by means of rapid quenching from the melt. Using a radially distributed magnetoelastic anisotropy term, we demonstrate that both the magnitude and the shape of the anisotropy distribution affect the value of their nucleation field, and, in well-defined cases, of their switching field. The analysis provides a good explanation framework for the characteristics of magnetic bistability in magnetostrictive glass-coated amorphous nanowires, enhancing the potential applicability of these novel ferromagnetic amorphous nanosized materials.