Nonlinear Properties of Magnesium Manganese Ferrite

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Abstract
Measurements have been taken on the ferromagnetic resonance properties of narrow‐linewidth single‐crystal magnesium manganese ferrite spheres at 9100 MHz and between 77°K and room temperature. The composition of the melt in mole percent was as follows: MgO 11.60%; MnO2 4.5%; Fe2O3 15.08%; PbO 34.41%; and PbF2 34.41%. This particular ratio of constituents was chosen in order to obtain an equal percentage of magnesium and manganese in the final samples. The actual composition of the samples investigated in this report was the following: Mg0.53Mn0.47Fe2O4. The low‐power resonance linewidth (ΔH) measured along the easy axis [111] was 8.4 Oe at 295°K and rises to 24.7 Oe at 77°K. The threshold field (hc) for spin‐wave excitation at 77°K was 250 mOe, while at room temperature it dropped to 100 mOe. From the room temperature threshold field, an intrinsic spin‐wave linewidth (ΔHk) of 270 mOe was calculated.

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