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Title: Long-Range Antiferromagnetic Order in a Rocksalt High Entropy Oxide

Journal Article · · Chemistry of Materials
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  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)

We report for the first time the magnetic structure of the high entropy oxide (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)O using neutron powder diffraction. This material exhibits a sluggish magnetic transition but possesses a long-range ordered antiferromagnetic ground state, as revealed by direct current and alternating current magnetic susceptibility, neutron diffraction, and spectroscopy. The magnetic propagation wavevector is k = (1/2, 1/2, 1/2) based on the cubic structure Fm3m, and the magnetic structure consists of ferromagnetic sheets in the (111) planes with spins antiparallel between two neighboring planes. Neutron spectroscopy reveals strong magnetic excitations at 100 K that survive up to room temperature. This work demonstrates that entropy-stabilized oxides represent a unique platform to study long-range magnetic order with an extreme chemical disorder.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1513391
Alternate ID(s):
OSTI ID: 1529267
Journal Information:
Chemistry of Materials, Vol. 31, Issue 10; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Cited By (4)

Magnetic anisotropy in single-crystal high-entropy perovskite oxide La ( C r 0.2 M n 0.2 F e 0.2 C o 0.2 N i 0.2 ) O 3 films journal January 2020
Magnetic frustration control through tunable stereochemically driven disorder in entropy-stabilized oxides journal October 2019
High-entropy ceramics journal February 2020
Photocatalytic hydrogen evolution on a high-entropy oxide journal January 2020

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