Long Range Magnetic Ordering and Magneto-(di) electric Effect in a New Class of High Entropy Spinel Oxide

Sourav Marik (1) , Deepak Singh (2) , Bruno Gonano (1, 3) , Fabien Veillon (1) , D. Pelloquin (1) , Yohann Bréard (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 ISIS Facility
3 UiO - University of Oslo

Herein, a new class of high entropy spinel material with composition (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Cr2O4 is introduced. Detailed structural and microstructural characterizations highlight that the sample crystallizes in a cubic spinel structure with an excellent chemical homogeneity at the nanoscale. A peak in the dielectric measurement is observed at the antiferromagnetic ordering temperature (35 K), indicating the possibility of magneto-electric coupling at that temperature. Our study, for the first time, highlights the feasibility to accommodate multiple elements onto a single sublattice in a complex spinel structure and opens new possibilities to design and tailor functional properties in high entropy stabilized correlated electron systems.

Mots clés: High Entropy Oxides; Spinel; Magneto-(di)electric effect

Domaines: Matériaux

Sourav Marik, Deepak Singh, Bruno Gonano, Fabien Veillon, D. Pelloquin, et al.. Long Range Magnetic Ordering and Magneto-(di) electric Effect in a New Class of High Entropy Spinel Oxide. Acta Materialia, 2019, 183, pp.107-110. ⟨10.2139/ssrn.3507452⟩. ⟨hal-03082280⟩