Strong uni-directional anisotropy in disordered NiFe2O4

Shi, Y.; Ding, J.; Shen, Z.X.; Sun, W.X.; Wang, L.

Publication

Strong uni-directional anisotropy in disordered NiFe2O4

Shi, Y.; Ding, J.; Shen, Z.X.; Sun, W.X.;
Wang, L.

Abstract

High-energy mechanical milling of spinel NiFe2O4 leads to the formation of a disordered wustite-like structure. Cluster glass behavior was round in the Moessbauer study. The investigation suggested ferrimagnetic clusters in an antiferromagnetic matrix. The ferrimagnetic and antiferromagnetic exchange coupling results in a strong uni-directional anisotropy and a coercivity of over 10 kOe after magnetic cooling.