MAGNETIC PHASE-DIAGRAMS OF DYSPROSIUM IRON-GARNET (DYIG) IN HIGH DC FIELDS

Magnetisation measurements have been performed on spherical single cry stals of dysprosium iron garnet (Dy3Fe5O12) in high de magnetic fields up to 16 T applied along the three principal crystallographic directi ons [111], [110] and [100]. The magnetic phase transitions near the in version (or compensation) temperature T-I between the collinear and th e field induced canted magnetic structures are observed and the differ ent associated magnetic phase diagrams precisely determined in the (H, T) plane. The mean exchange field acting on the Dy ions and the effect ive anisotropy field are deduced to be (12.9+/-0.2)T and (1.2+/-0.1) T respectively. Above 228.2+/-0.5 K, only the collinear magnetic phase exists for all the directions. These results are compared to previous high pulsed magnetic fields data. (C) 1998 Elsevier Science S.A.