The molar composition ratios in the melt, to support submicron diameter magnetic bubbles in a YCaSmTmGeIG system, have been investigated. Films of saturation magnetization 4πMs ranging from 511 to 919 gauss were grown on (111)‐oriented GGG using conventional LPE dipping techniques. A stripe domain width Sw ranging from 1.31 to 0.71 μm and a collapse field Ho of 287 to 625 Oe for this garnet system have been obtained. Films of SmTmIG , in which 4π M s =1378 gauss, S w = 0.56 μ m , H o = 900 Oe , were grown using similar techniques. From these experimental results growth‐induced anisotropy was found to roughly approximate to the following empirical relation for a YCaSmTmGeIG system in which four ions were substituted on {24C} sites: K u ( M s x ) = K uo M s x/M so x o . Where K uo and M so are growth‐induced anisotropy and saturation magnetization of SmTmIG , respectively. Ku and Ms are these notations for a YCaSmTmGeIG system. x is the variable related to the composition of Sm and Tm ions in this garnet system, while that for SmTmIG is defined as xo. This formulation is also found to be appricable in a YCaSmLuGeIG system.