Abstract
Using a torque magnetometer, experimental results are reported on some new magnetic properties in high-purity, optical-quality single crystals of lithium fluoride, potassium chloride, and sodium chloride. Since the torque observations are not produced by the gross diamagnetism of these salts, the magnetic centers may be along dislocations because the magnetic susceptibility is observed to possess uniaxial anisotropy. Soft x irradiation increased the observed magnetization. In addition, there is a cooperative interaction among the magnetic centers which gives a remanent magnetization. The temperature dependence of the remanent magnetization is similar to the Bloch spin-wave concept of ferromagnetism. These new magnetic properties are an order of magnitude smaller when measured in crystals of magnesium fluoride and of calcium fluoride.
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