Suppression of hard bubbles in magnetic garnet films by ion implantation: Dependence on ion species, dose, energy, and annealing

Abstract

Hard bubbles in typical bubble garnets can be eliminated by ion implantation which produces a layer of planar magnetization at least a few hundred angstroms thick. Neon at doses in the 10¹⁴‐ions/cm² range is as effective as hydrogen at doses in the 10¹⁶‐ions/cm² range in suppressing hard bubbles without effecting domain wall coercivity or mobility. Annealing studies have shown that the thermal stability of the effect increases with increasing dose and decreasing energy of implantation and is sufficient to withstand maximum device processing temperatures and assure long lifetimes.