RELAXATION IN FINE-PARTICLE MAGNETIC SYSTEMS

Relaxation behaviour of fine particle magnetic systems has been a subj ect of interest since a long time. Recent reports, on the dependence o f blocking temperature on measuring time, concentration and external m agnetic field, have evoked greater interest in the field. These observ ations show some interesting analogies with spin glasses and have also been reasonably explained in Neel's model incorporating inter-particl e magnetic dipolar interactions. A brief review is presented on develo pments in the subject.