Magnetization reversal of thin ferromagnetic elements with surface anisotropy

TL;DR

This paper investigates how surface anisotropy influences magnetization reversal in thin ferromagnetic elements, revealing that large surface anisotropy causes reversal via buckling mode nucleation, with specific dependencies on element shape and size.

Contribution

It introduces a numerical simulation study showing the role of surface anisotropy in magnetization reversal mechanisms in thin-film ferromagnetic elements.

Findings

Reversal occurs through buckling mode nucleation at high surface anisotropy.

Nucleation field is proportional to surface anisotropy constant.

Nucleation field is inversely proportional to element thickness.

Abstract

The magnetization reversal process in thin-film ferromagnetic elements with surface anisotropy of various shapes and sizes is investigated by means of numerical simulation. The dependence of the perpendicular and in-plane hysteresis loops on the element thickness and the value of the surface anisotropy constant is obtained. For sufficiently large values of the surface anisotropy constant the magnetization reversal of thin-film elements is shown to occur due to the nucleation of the buckling mode. For an elongated rectangular element the nucleation field of the buckling mode is proportional to the absolute value of the surface anisotropy constant, and inversely proportional to the element thickness.