Gallium concentration effects on magnetic bubble films of EuTm2(Fe,Ga)5O112 garnet grown by liquid phase epitaxy

By varying the Ga concentrations x of EuTm₂Fe_5?xGa_xO₁₂ from x = 0 to about 0.8, thin magnetic films supporting stable bubbles with diameters from 0.5 to about 8μm, respectively, are deposited epitaxially onto gadolinium gallium garnet substrates oriented (111). For low values of x, the Ga segregation coefficient is about 2 and it decreases slightly as x increases. Thus, films contain roughly twice as much Ga as the LPE fluxed melts in which they grow. Both the characteristic length and magnetic bubble stability factor (Q) increase rapidly with x and, to a lesser degree, so does the uniaxial anisotropy field H_A while both 4πM and the uniaxial anisotropy K_u decrease.