Abstract
Measurements are reported on the magneto-crystalline anisotropy of manganese ferrous ferrites at low temperatures. Results are also given on the anisotropy that can be induced by cooling the samples in a magnetic field down to 4°K. The local symmetry axis of this uniaxial anisotropy is the [100] axis. Time dependent anisotropies at 4°K have been found. These manifest themselves as a rotational hysteresis and as a time dependent torque. These quantities can be described by an extension of the after-effect theory of Néel's. At lower temperatures another contribution to the rotational hysteresis appears, that is independent of time and field, it depends linearly on the concentration of ferrous ions.
Published Version
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