Abstract
1. (a) US, USe and UTe are ferromagnets as well as a great variety of mixed crystals. The magnetic moments are strictly confined to the 〈111〉 easy axis. Moments measured along any other axis are merely the projections of the moment induced along the 〈111〉 axis. The shape of the hysteresis loop depends critically on temperature even far below the Curie temperature, due to thermal activation of monoatomic Bloch walls. Even if the maximum magnetization is observed along the 〈111〉 direction, it is in some cases easier to reach saturation by applying a magnetic field along another axis. The observed anisotropy cannot be of a simple uniaxial nature. 2. (b) UN, UP, UAs, USb, and UBi are antiferromagnets together with many mixed crystals. Magnetic moments in the ordered state and spin structures were determined by neutron diffraction experiments. We can observed magnetic transitions in experimentally achievable fields (200 kOe for our experiments). Such measurements permit us to establish a magnetic phase diagram. In many antiferromagnets we encounter predominant domain effects. Up to 70 kOe of applied field are necessary to obtain single domain crystals.
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