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We have observed that thicker than normal LPE bubble garnet films (14–17 μm) have lower coercivity than those of normal thickness (3–5 μm). We have investigated this thickness dependence of 4 film compositions in the SmCaGe garnet system. In thin films, coercivity is dominated by a high coercivity region near the substrate. As the film thickness increases, the coercivity decreases approaching a ’’bulk’’ value. The two portions of the film, with their different properties, produce a linear relationship of coercivity versus reciprocal thickness which should be taken into account when comparing coercivities of LPE garnet films.

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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

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