Magnetic Properties of Fe5Ge3–Mn5Ge3 Solid Solutions

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Abstract
Measurement of saturation magnetization and Curie temperature were made of the solid solutions (Fe1−yMny)1.67Ge for 0≤y≤0.4. The Curie temperature decreased linearly from 485° to 326°K while the saturation magnetization, in μβ per mole, decreased from 2.65 to 2.35 for y=0.2 and then increased up to 2.66 for y=0.4. The limit of the solid-solution field is the ordered ternary compound Fe0.9Mn0.9Ge with Curie temperature 241°K and 1.39 μβ per mole. The manganese with a magnetic moment of 3.0 μβ preferentially substitutes for iron with 1.80 μβ in (2a) sites of Fe1.67Ge. The net moment is decreased by the increasing antiferromagnetic component of iron atoms in (2d) sites with its cant angle increasing from 28° to 80° for y=0.2, while for 0.2<y≤0.4, the cant angle remains at 80° and the net moment increases. The ferromagnetic structure of the ordered compound Fe0.9Mn0.9Ge has a manganese sublattice (2a) similar to same one in Mn5Ge3 and an iron sublattice (2d) comparable to that of Fe5Ge3. Hyperfine fields also indicate additivity of the two sublattices from the binary compounds.

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