Magnetization measurements of the ferrite system Mg l+xMnxFe2_7~O 4 were undertaken primarily to study variation of the saturation magnetization with manganese concentration and to gain information about the type of magnetic ordering. The observations indicate the existence of Yafet-Kittel (YK) type of magnetic ordering in this system which is well supported by results of MiJssbaner effect measurements. A molecular field analysis of the YK spin ordering using the three-sublattice model is shown to explain the experimental data satisfactorily.

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The structural and magnetic properties of the mixed spinel Col+xSixFe2_zrO 4 system for 0-1

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