Some ferrimagnetic and antiferromagnetic materials at low temperatures

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Abstract
The magnetization of single crystals and of polycrystals of a number of materials has been investigated at temperatures from 1. 3 to 300 °K, in fields up to 12,500 oersteds. Measurements were made on single crystals of LiMnPO4 (orthorhombic), Fe 3(PO4)2.4H2O (monoclinic), and HoFeO 3 (orthorhombic) ; polycrystalline materials were HoFeO3, Ho2O3, and Er2O3, PbO.Fe 12—xAlxO18, FeTiO3 and FeTiO 3-Fe2O3 solid solutions, CoMnO and MiMnO 3, CuF2.2H2O, MnF3, and CrF3 . The ferromagnetic single crystals show spontaneous magnetization along one crystallographic direction ; in Fe3(PO4) 2 .4H2O it was not possible to rotate the spontaneous magnetization out of the direction of the axis, in HoFe3O it is readily rotated away from the preferred orthorhombic axis at low temperatures. The spontaneous magnetization in HoFeO3 rises to about 3 Bohr magnetons as the temperature is lowered

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