Abstract
Experiments to measure several macroscopic magnetic properties of thin rare earth garnet films used in the manufacture of magnetic bubble devices are described. Using the magneto-optic Faraday effect to measure the net component of magnetization normal to the film the shape of hysteresis loop, coercive field, Curie temperature, anisotropy field and the variation of magnetization with temperature can be determined. The results of the latter two measurements agree very well with theoretical predictions. As inexpensive or standard laboratory equipment is used the experiments are ideally suited to use in an undergraduate teaching laboratory.
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