COMPOSITION DEPENDENCE OF MAGNETIZATION IN CO1-XCDXFE2O4 FERRITES

Seven samples of the system Co1-xCd(x)Fe2O4 were prepared by the usual ceramic technique with x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1. The magnetization of the samples was measured in high magnetic field up to 150 kOe and in the temperature range from 4.2 to 300 K. The composition dependence of the saturation magnetization showed a maximum at x almost-equal-to 0.35. Both statistical and noncollinear models were applied to calculate theoretically the variation of saturation magnetization with composition at 4.2 K. The noncollinear structure model seems to fit our results better. Direct confirmation for the existence of the noncollinear spin structure (canted) was found from the behaviour of magnetization in the high field region, 75-150 kOe.