Six-fold configurational anisotropy and magnetic reversal in nanoscale Permalloy triangles

TL;DR

This study investigates the six-fold magnetic anisotropy in nanoscale Permalloy triangles, revealing complex reversal behaviors and emphasizing the importance of physical rounding in simulations for accurate modeling.

Contribution

It provides a comprehensive experimental and numerical analysis of magnetic reversal in Permalloy triangles, highlighting the role of shape symmetry and physical rounding effects.

Findings

Measured twelve-point switching astroid matching simulations

Identified specific magnetic transition quadrants

Showed physical rounding influences Y state stability

Abstract

Six-fold configurational anisotropy was studied in Permalloy triangles, in which the shape symmetry order yields two energetically non-degenerate micromagnetic configurations of the spins, the so-called "Y" and "buckle" states. A twelve pointed switching astroid was measured using magneto-optical experiments and successfully reproduced numerically, with different polar quadrants identified as specific magnetic transitions, thereby giving a comprehensive view of the magnetic reversal in these structures. A detailed analysis highlighted the necessity to include the physical rounding of the structures in the simulations to account for the instability of the Y state.