A new method has been developed for measurement of coercive force in bubble garnets using microwave absorption. The inflection point was observed in the derivative absorption signal when the measurement was carried out, changing the modulation field in a garnet film supporting magnetic bubbles. This inflection is related to the domainhyphen;wall absorption and the modulation field at the inflection point gives the coercive force in the garnet film. Using this method the coercive force can be determined even if the bubbles can hardly be observed. The coercive force of garnet films supporting submicron (0.3ndash;1 mgr;m diam) bubbles has been measured.
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