Magnetic Structure Characterization of Spinel Type High Entropy Oxide (MnFeCrCoNi)3O4

High entropy oxides (HEOs) are crystallographically ordered compounds comprised of an equimolar proportion of five randomly distributed cations and a chemically ordered oxygen anion sublattice. In the formation of these crystals at high temperatures, the energy scale of configurational entropy rivals the enthalpy of formation for constituent oxide phases and minimizes the Gibbs free energy to produce a single-phase material. The discovery of long-range antiferromagnetic ordering in (MgCoNiCuZn)_0.2O at T_N = 113 K despite intense chemical disorder and a 40% magnetic dilution highlights the importance of studying magnetic order in these materials. More recently, there have been promising advancements in the synthesis of spinel type HEOs based on 3d transition metals. Here we presented a detailed structural and magnetic characterization of the spinel (MnFeCrCoNi)₃O₄ with the goal of elucidating the relationship between magnetism and chemical disorder. We verify the high entropy phase by Rietveld refinement and energy dispersive x-ray spectroscopy. Our magnetic susceptibility measurements reveal that this HEO transitions into a ferrimagnetic ordered state below 400 K. We will present the magnetic structure of (MnFeCrCoNi)₃O₄ determined from neutron diffraction.