Ferromagnetic Resonance in Single Crystals of Fe-Ni Ferrite System

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Ferromagnetic resonance experiment on single crystals of Ni_xFe_<3-x>O_4 (0.2≦x≦0.8) has been carried out at 9300Mc/s to study their ferromagnetic crystalline anisotropy and g-value. For all compositions a monotonic increase of K_1/M was observed as the temperature decreased, similarly to the curves obtained from the torque method. As a whole, however, considerably smaller values were obtained than the latter. g-value, also, increased as the temperature was decreased for all compositions and showed larger variations as x was smaller. Qualitative explanation was tried from the view point of Clogston's thermodynamic theory.
横浜国立大学の論文