Microscopic magnetic structuring of a spin-wave waveguide by ion implantation in a Ni(81)Fe(19) layer

TL;DR

This paper demonstrates that localized Cr+ ion implantation can effectively create microscopic spin-wave waveguides in NiFe films, enabling precise magnetic patterning for magnon spintronics.

Contribution

It introduces a novel ion implantation technique for fabricating magnetic waveguides with tunable properties in ferromagnetic films.

Findings

Ion implantation increases damping and reduces saturation magnetization.

Waveguide performance depends on doping fluence.

Localized ion implantation is effective for magnon device patterning.

Abstract

We investigate the spin-wave excitation in microscopic waveguides fabricated by localized Cr+ ion implantation in a ferromagnetic Ni(81)Fe(19) film. We demonstrate that spin-wave waveguides can be conveniently made by this technique. The magnetic patterning technique yields an increased damping and a reduction in saturation magnetization in the implanted regions that can be extracted from Brillouin light scattering measurements of the spin-wave excitation spectra. Furthermore, the waveguide performance as well as the internal field of the waveguide depend on the doping fluence. The results prove that localized ion implantation is a powerful tool for the patterning of magnon spintronic devices.