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Magnetic Properties of Ge-, Re-, and Cr-Substituted Fe5SiB2 Gap Magnets

A study of rare-earth-free permanent-magnet candidates that synthesizes Ge-, Re-, and Cr-substituted Fe5SiB2 (all crystallizing in the Cr5B3-type tetragonal I4/mcm structure) and measures how elemental substitution tunes gap-magnet properties. Curie temperature and saturation magnetization decrease only modestly (Re has the largest effect, keeping TC > 750 K), while the room-temperature anisotropy field measured by Singular Point Detection rises about 15% to 0.92 T for Fe4.75Re0.25SiB2. Nuclear magnetic resonance and SPD reveal that the 172 K spin-reorientation transition is lowered by Ge and fully suppressed by Cr and Re substitution.