Ferromagnetic resonance and magnetoresistive measurements evidencing magnetic vortex crystal in nickel thin film with patterned antidot array

TL;DR

This paper demonstrates the creation of ferromagnetic vortex lattices in nickel thin films with patterned antidot arrays, using nanolithography and magnetic measurements, advancing potential data storage applications.

Contribution

It introduces a one-step nanolithography method to generate and control magnetic vortex crystals in nickel films, supported by experimental and simulation evidence.

Findings

Successful creation of vortex lattices in nickel films

Experimental evidence from ferromagnetic resonance and magnetoresistance

Support for theoretical vortex structure predictions

Abstract

Ferromagnetic vortices deliver robust out-of-plane magnetization at extremely small scales. Their handling and creation therefore has high potential to become a necessary ingredient for future data storage technologies in order to keep up with the pace of growing information density demands. In this study we show that by using one step nanolithography method, we are able to create ferromagnetic vortex lattices in thin nickel films. The necessary control of the magnetic stray field at the domain edges was achieved by actively modifying the ferromagnetic thin film anisotropic properties at nanometer scale. We present experimental evidence using ferromagnetic resonance and magnetoresistance measurements supporting simulations based on the theoretical prediction of the proclaimed vortex structures.