The effect of Ga-ion irradiation on sub-micron-wavelength spin waves in yttrium-iron-garnet films

Greil, Johannes and Kiechle, Martina and Papp, Ádám and Neumann, Péter Lajos and Kovács, Zoltán and Volk, János and Schulz, Frank and Wintz, Sebastian and Weigand, Markus and Csaba, György and Becherer, Markus (2025) The effect of Ga-ion irradiation on sub-micron-wavelength spin waves in yttrium-iron-garnet films. NANOTECHNOLOGY, 36 (13). ISSN 0957-4484

Preview

Text GGreil_2025_Nanotechnology_36_135301.pdf - Published Version Available under License Creative Commons Attribution. Download (817kB) | Preview

Abstract

We investigate the effect of focused-ion-beam (FIB) irradiation on spin waves with sub-micron wavelengths in yttrium-iron-garnet films. Time-resolved scanning transmission x-ray microscopy was used to image the spin waves in irradiated regions and deduce corresponding changes in the magnetic parameters of the film. We find that the changes of Ga + irradiation can be understood by assuming a few percent change in the effective magnetization M eff of the film due to a trade-off between changes in anisotropy and effective film thickness. Our results demonstrate that FIB irradiation can be used to locally alter the dispersion relation and the effective refractive index n eff of the film, even for submicron wavelengths. To achieve the same change in n eff for shorter wavelengths, a higher dose is required, but no significant deterioration of spin wave propagation length in the irradiated regions was observed, even at the highest applied doses.

Actions (login required)

Edit Item