EFFECT OF COHERENT ANISOTROPY ON THE H-T PHASE-DIAGRAM OF RANDOM ANISOTROPY MAGNETS OF AMORPHOUS DYGDFE

For two amorphous (a-) DyGdFe films, one with a weak coherent anisotro py (CA) and the other with a strong CA, we measured magnetization and ac susceptibility in small de fields (H), and determined the H-T phase diagrams. The results suggest that a ferrimagnetic-like phase is indu ced by the strong CA, and the system shows a double transition from pa ramagnetic to a ferrimagnetic-like to a randomly-frozen state for H = 0. Without strong CA, such a double transition disappears.