Pyromagnetic Effect: A Method for Determining Curie Points

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Abstract
A dynamic technique has been developed for studying the pyromagnetic effect (the change in the intensity of magnetization, I, with temperature, T). The thermal transients produced in a crystal of gadolinium iron garnet when subjected to brief, intense, flashes of light, result in transient changes in the intensity of magnetization. The magnitude of the signal picked up by the detector coil is determined by the pyromagnetic coefficient (dI/dT), and the rate of change of the temperature. No externally applied magnetic field is necessary to obtain these signals and, furthermore, the net state of magnetization of the crystal is determined nondestructively. As (dI/dT) possesses a very sharp peak at the Curie point, the latter can be determined simply and with some precision; the actual temperature change produced in the crystal by the light can be kept to a small fraction of a degree. The Curie point for gadolinium iron garnet was found to be 564±3°K. The technique may prove to be useful for studying the behavior of (dI/dT) at low temperatures.

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