Micromagnetic reversal behavior of multiscale permalloy elements

Abstract

A micromagnetic study of the reversal mechanism in permalloy antidot arrays J. Appl. Phys. 111, 053915 (2012); 10.1063/1.3689846Six-fold configurational anisotropy and magnetic reversal in nanoscale Permalloy triangles Effect of the classical ampere field in micromagnetic computations of spin polarized current-driven magnetization processes Lorentz microscopy has been used to study the micromagnetic processes occurring during the reversal of multiscale permalloy elements. The elements, which have similar dimensions to write heads used in magnetic recording, typically have length scales varying from 10 m in the element "core" down to 100 nm in the element "tip." A discussion of the effect of varying the geometry and critical dimensions of the elements on the reversal behavior and switching fields is presented. While the magnetization processes in the core tend to be similar to what is observed in the absence of a tip, the presence of the core strongly influences the tip reversal, even for tips with widths of 100 nm. The results demonstrate clearly the role played by shape anisotropy in complex shaped elements fabricated from an isotropic magnetic film.

Influence of the asymmetry on reversal process and vortex motion in egg-shaped permalloy plates

“…The magnetic vortex has been studied from various aspects such as nucleation, annihilation, and field‐induced or current‐induced dynamics 8–11. In real systems, the shape, grain size, anisotropy, and edge roughness are some of the key factors that influence the magnetization structure and reversal mode 1, 12–14. Among these factors, size and shape are especially important.…”