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Title: Tuning the Néel Temperature of Hexagonal Ferrites by Structural Distortion

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [3];  [1];  [4];  [2];  [5];  [6];  [6];  [7];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Bryn Mawr College, Bryn Mawr, PA (United States)
  3. Temple Univ., Philadelphia, PA (United States); Peking Univ., Beijing (People's Republic of China)
  4. Fudan Univ., Shanghai (People's Republic of China)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Temple Univ., Philadelphia, PA (United States)

To tune the magnetic properties of hexagonal ferrites, a family of magnetoelectric multiferroic materials, by atomic-scale structural engineering, we studied the effect of structural distortion on the magnetic ordering temperature (TN) in these materials. Using the symmetry analysis, we show that unlike most antiferromagnetic rare-earth transition-metal perovskites, a larger structural distortion leads to a higher TN in hexagonal ferrites and manganites, because the K3 structural distortion induces the three-dimensional magnetic ordering, which is forbidden in the undistorted structure by symmetry. We also revealed a near-linear relation between TN and the tolerance factor and a power-law relation between TN and the K3 distortion amplitude. Following the analysis, a record-high TN (185 K) among hexagonal ferrites was predicted in hexagonal ScFeO3 and experimentally verified in epitaxially stabilized films. These results add to the paradigm of spin-lattice coupling in antiferromagnetic oxides and suggests further tunability of hexagonal ferrites if more lattice distortion can be achieved.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
1510071
Alternate ID(s):
OSTI ID: 1484974; OSTI ID: 1530115
Journal Information:
Physical Review Letters, Vol. 121, Issue 23; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (6)

Perspectives of multiscale rare earth crystal materials journal January 2019
Structural phase diagram and magnetic properties of Sc-substituted rare earth ferrites R 1− x Sc x FeO 3 ( R  = Lu, Yb, Er, and Ho) journal June 2019
Single-phase multiferroics: new materials, phenomena, and physics journal July 2019
Pressure-induced large enhancement of Néel temperature and electric polarization in the hexagonal multiferroic L u 0.5 S c 0.5 Fe O 3 journal December 2019
DEMAND, a Dimensional Extreme Magnetic Neutron Diffractometer at the High Flux Isotope Reactor journal December 2018
Structural phase diagram and magnetic properties of Sc-substituted rare earth ferrites R1-xScxFeO3 (R=Lu, Yb, Er, and Ho) text January 2019

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