PURPOSE:To enable the stable operation of the magnetic bubble garnet film extending over a wide temperature range by a method wherein the temperature changing rate of Ho is kept to be small by Gd and the Curie temperature is made to be high by Ge to spread the application limit. CONSTITUTION:A magnetic bubble garnet film is formed having a composition being indicated with the formula, and the point x, y indicating respectively the quantity of Gd and Ge is situated within a region A being surrounded with lines a, b, c, d. Within this range, a magnetic bubble having the diameter of 2.5mum or less can exist stably, and the temperature changing coefficient of Ho is kept within the range of -0.05-+0.05%/ deg.C. That is, the temperature changing rate of Ho is kept to be small by Gd and the Curie temperature is made to be high by Ge being the application limit spreaded to enable the stable operation extending over a wide temperature range.
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