Charge redistribution, orbital moment collapse and new high-temperature magnetic phase in magnetoelectric epsilon-(Fe,Cr)2O3 polymorph
Epsilon-Fe2O3 displays remarkable properties such as huge coercivity, magnetoelectric coupling, multiferroicity at room temperature in film form and rich magnetic and magnetostructural properties that are still poorly studied. It is one of the less studied ferrimagnetic iron oxides due to its difficult preparation. It presents a complex non-centrosymmetric Pna21 frustrated structure isomorphous to the multiferroic GaFeO3. We have recently identified up to five different magnetic transitions in our nanograin pure and doped with Cr samples (between 70 and 870K) and, associated to them, magnetoelectric, structural, magnetoelastic anomalies, abrupt orbital moment quenching, super-hard ferrimagnetism, charge-redistributions not yet well described, etc. This experiment aims to monitor and describe subtle structural changes and magnetic changes that activate/desactivate the spin-orbit coupling in selected sites of the structure at particular temperatures. The substitution by Cr produces appealing changes which strongly depend on the considered magnetic phase.
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Jose Luis Garcia-Muñoz; CUELLO Gabriel; Martí Gich; MA Zheng; Arnau Romaguera; SAVVIN Stanislav and ZHANG XIAODONG. (2019). Charge redistribution, orbital moment collapse and new high-temperature magnetic phase in magnetoelectric epsilon-(Fe,Cr)2O3 polymorph. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2615
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