Abstract
Previous neutron diffraction studies have established the ferrimagnetic coupling of cobalt and holmium magnetic moments in HoCo 5. However, owing to the competition of cobalt and holmium local anisotropies, which have opposite signs, a non-collinear magnetic structure is suggested at low temperatures. By combining magnetization measurements on a single crystal with Mössbauer and neutron diffraction experiments, we compared the directions of the cobalt and holmium magnetizations with that of the bulk spontaneous magnetization. Above 200 K all the magnetic moments are parallel to the c axis of the hexagonal structure. Below 200 K the magnetic structure becomes noncollinear owing to the reorientation of the magnetizations. The direction of the bulk spontaneous magnetization is very different from those of the cobalt and holmium magnetizations.
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