New high−speed bubble garnets based on large gyromagnetic ratios (high g)

Abstract

A new approach to overcoming the problem of dynamic conversion in high−mobility bubble garnets is described based on large gyromagnetic ratios (high g factors). In a film of Eu1.45Y0.45Ca1.1Fe3.9Si0.6Ge0.5O1 2, a g factor greater than 30 has been obtained, which increases the usable domain wall velocity before onset of dynamic conversion by more than an order of magnitude over comparable bubble garnet films with g approximately 2. Using a circuit period of 28.8 μm, propagation data showing no deterioration in bias margins out to 107 steps were obtained on this film at 1 and 2 MHz.