Abstract
We have investigated the magnetic properties of strong itinerant ferromagnetic Fe 72Pt 28 (ordered and disordered phases) at pressures up to 8 GPa and at various temperatures (300 to 4.2 K) using the 57Fe high pressure Mössbauer effect technique. We observe (in both cases) for the first time a pressure-induced magnetic phase transition from the ferromagnetic (FM) high-moment state to a low-moment magnetic state. The result is consistent with recent theoretical calculations of the volume dependence of the Fe moment in FM pure fcc Fe. This observation clearly demonstrates a unique physical picture of the ferromagnetism in 3d ferromagnetic systems that exhibit large magnetovolume anomalies. The effect of atomic ordering on the stability of the FM ground state is also discussed.
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