Abstract
Measurements of ac initial susceptibility, magnetization and paramagnetic susceptibility have been made along the principal axes of Tb–Er single crystal alloys. It is found that the magnetic structures of cone, tilted helix, flat helix and basal plane ferromagnet appear at 4.2 K in the sequence of increasing Tb concentration in this system. The tetracritical point showing a coexsistence of CAM, mixed CAM, helix and paramagnet is observed at 87 K for Tb 0.05 Er 0.95 alloy. From the analyses of the Neel temperatures and the anisotropic paramagnetic Curie temperatures, the exchange interactions J (Q), J (O) and the magnetocrystalline anisotropy K 2 para 0 in the paramagnetic state were estimated on the basis of the molecular field theory.
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