ScienceAsia 5 (1979): 131-144 |doi: 10.2306/scienceasia1513-1874.1979.05.131

SPONTANEOUS MAGNETIZATION OF AN INVERSE SPINEL FERRITE

CHOMKWAN PRAYOONWECH^a and I-MING TANG^b

Summary: A molecular field theory is developed for the inverse spinel ferrite Fe₃0₄ which takes into account the disorder arising from the random arrangement of two types of magnetic ions in the B sublattice. It is shown that the perturbative expansion of the propagators can be partially summed. A diagrammatic interpretation of the summation is given. By numerically solving a set of nonlinear equations. the spontaneous magnetization curve for Fe₃0₄ is obtained.

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a Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
b Department of Physics, Faculty of Science, Mahidol University, Bangkok 4, Thailand

Received 9 August 1979