Ferromagnetic Crystalline Anisotropy of Fe-Mn-Ferrite System

Abstract

Ferromagnetic resonance absorption of microwave (9300 Mc/s) in synthetic single crystals of Mn x Fe 3- x O 4 (0.2≦ x ≦1.15) has been investigated to study their magnetic crystalline anisotropy, g -factor and line width. The pronounced valley in the curve, magnetic crystalline anisotropy (- K 1 / M ) v s . composition ( x ), was observed in the temperature region between 90°K and 300°K. - K 1 / M was a minimum in the region 0.6< x <0.7 and changed its sign. g -value and line width decreased with x more rapidly in the region x <0.6 than x >0.6. It seems difficult to explain these experimental results on the view point of one-ion-model which proved successful in many other ferrites.