The anisotropy dependence of bubble dynamics in EuGaYIG films

Abstract

We have studied the dynamic properties of bubbles in a series of oxygen-annealed EuGaYIG films which have similar magnetic properties except for decreasing uniaxial anisotropy as a function of anneal time. The translational saturation velocity and skew angle of bubbles translated in a pulsed gradient field experiment increase as the anisotropy decreases. These results are in agreement with theoretical predictions of a K.-" 2 dependence. We also observe that for a given anisotropy and bubble state (S = 1), the skew angle decreases as the drive increases. in agreement with theory which predicts that if the velocity is saturated, drive and angle are inversely related. PACS numbers: 75.70.Kw, 76.50.+g [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 128.252.67.66 On: Tue, 23 Dec 2014 02:43:35