Abstract
Abstract The hard magnetic properties of the alloy Ag5MnAl have been investigated after heat treatment at various temperatures in the range 250°c–895°c. A new ‘ferromagnetic’ (probably ferrimagnetic) phase has been observed which is produced by rapid cooling to room temperature from the range 880°c–895°c. Although the remanent magnetization of the new phase is relatively low, ∼0.66 e.m.u./g, the coercivity is ∼5000 oe. Heat treatment at other temperatures resulted in a very wide range of properties, e.g. coercivities ranging from 3800 oe to 7800 oe were obtained while the remanent magnetization varied from 0.65 to 5.0 e.m.u./g. The maximum magnetic hardness was obtained by heat treatment at 280°c for 130 hr. One of the most striking properties of all the ferromagnetic specimens is that they can be magnetized with equal facility in any direction regardless of the specimen geometry. The effects of temperature and of the application of a field of 164 koe have also been investigated. The coercivities H c and H R increase linearly as the temperature decreases, but they are not significantly affected by the application of the 164 koe field, although there are large increases in the remanent magnetizations.
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