Magnetic Transition in Magnetite

Novel Pressure-Induced Magnetic Transition in Magnetite (Fe3O4)
Ding, Y., D. Haskel, S.G. Ovchinnikov, Y.-C. Tseng, Y.S. Orlov, J.C. Lang, and H.K. Mao,
Phys. Rev. Lett., 100, 045508, (2008)

A long-standing anomaly in Fe3O4 between 12 and 16 GPa was found to arise from a high-spin to intermediate-spin transition of Fe2+ ions in octahedral site and could account for previously observed structural and electrical anomalies in magnetite at this pressure range. The new data from HPCAT 16ID-D is supported by XMCD data and theoretical cluster calculations.

The Kb’ satellites from high pressure XES measurement on magnetite from 8.8 to 20.6 GPa.  The changes in XES are attributed to HS-IS transition in Fe2+ while the two Fe3+ remain HS.