Anti-vortex state in cross-like nanomagnets

TL;DR

This paper demonstrates the formation of stable anti-vortex magnetic states in asymmetrical cross-like nanostructures through computer modeling and experimental validation, advancing understanding of complex magnetic configurations in nanomagnets.

Contribution

It introduces the first experimental observation and computer modeling of anti-vortex states in asymmetrical cross-like nanomagnets with specific fabrication details.

Findings

Stable anti-vortex states observed during magnetization reversal.

Successful fabrication of cobalt cross nanostructures with specified dimensions.

Computer models align with experimental magnetic force microscopy results.

Abstract

We report on results of computer micromodelling of anti-vortex states in asymmetrical cross-like ferromagnetic nanostructures and their practical realization. The arrays of cobalt crosses with 1 mkm branches, 100 nm widths of the branches and 40 nm thicknesses were fabricated using e-beam lithography and ion etching. Each branch of the cross was tapered at one end and bulbous at the other. The stable formation of anti-vortex magnetic states in these nanostructures during magnetization reversal was demonstrated experimentally using magnetic force microscopy.