PERMINVAR-LIKE BEHAVIOR IN SOME HEXAGONAL FERRITES

A novel, perminvar-like behaviour of the magnetization curves in the h ard direction of titanium containing bulk and thin film barium hexagon al ferrites was observed at low temperatures. The DC moments and AC su sceptibilities in the 1-1000 Hz frequency range were measured by VSM a nd SQUID magnetometers in the easy and hard magnetic directions at tem peratures from 5 to 300 K. The perminvar-like effects were explained o n the basis of the reorientation of Fe2+-Ti4+ pairs in octahedral 12k sites of the hexagonal lattice.