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Magnetic Properties of Dy–Th Single Crystal Alloys

Measurements of the magnetization and the magnetic susceptibility have been made along the principal axes of Dy–Th single crystal alloys with the hexagonal close-packed structure. The alloys exhibit a ferromagnetic structure at low temperatures in all composition region and screw antiferromagnetism appears in the sequence of the increase of the temperature in the composition less than about 12 at% Th. Magnetic transition temperatures T c and T N increase and decrease with increasing Th concentration, respectively. The magnetocrystalline anisotropy constant K 2 0 was determined from the analysis of the hard magnetization curve. And the exchange interaction constant j ( Q ) was determined from the magnetic transition temperatures, and j (0) and the magnetocrystalline anisotropy constant K 2 0 para in the paramagnetic state were also determined from the analysis of the paramagnetic susceptibility, respectively, on the basis of the molecular field theory.