Pyromagnetic Effect: A Method for Determining Curie Points
Pyromagnetic Effect: A Method for Determining Curie Points
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热磁效应：一种确定居里点的方法
DOI：
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发表时间：
1958
期刊：
影响因子：
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通讯作者：
A. Chynoweth
中科院分区：
文献类型：
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作者：
A. Chynoweth
发展了一种动态技术来研究热磁效应（磁化强度I随温度T的变化）。当受到短暂的、强烈的闪光时，钆铁石榴石晶体中产生的热瞬态导致磁化强度的瞬态变化。由检测器线圈拾取的信号的幅度由热磁系数（dI/dT）和温度变化率确定。没有外部施加的磁场是必要的，以获得这些信号，此外，非破坏性地确定晶体的磁化的净状态。由于（dI/dT）在居里点处有一个非常尖锐的峰值，因此可以简单地确定居里点，并具有一定的精度;光在晶体中产生的实际温度变化可以保持在几度的一小部分。钆铁石榴石的居里点为564±3°K。该技术可能被证明是有用的研究的神经网络。
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 behav...