Coercivity and Nano-structure in Magnetic Spinel Mg(Mn,Fe)$_{2}$O$_{4}$

ORAL

Abstract

We discovered that the micro-to-nano-structure of Mg(Mn,Fe)$_{2}$O$_{4}$ drastically changes with different thermal treatment. This extraordinary structural evolution is associated with spinodal chemical decomposition associate with the Jahn-Teller structural distortions around Mn ions. The magnetic properties of the polycrystalline Mg(Mn,Fe)$_{2}$O$_{4}$ vary with the structural progress. Particularly, the Curie temperature and magnetic coervcivity considerably change with the structural evolution. The significantly-enhanced coercivity in the system with elongated nanostuructre stems from the large shape anisotropy of the nanostructure.

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Authors

  • Chenglin Zhang

    Physics Department, Rutgers University

  • S. Yeo

  • SangWook Cheong

    Department of Physics \& Astronomy, Rutgers University, Piscataway, New Jersey 08854, Physics Department, Rutgers University, Rutgers University, Dept. of Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, Department of Physics, Rutgers, Rutgers Univ.