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Title: Effects of biaxial strain on the improper multiferroicity in h LuFe O 3 films studied using the restrained thermal expansion method

Elastic strain is potentially an important approach in tuning the properties of the improperly multiferroic hexagonal ferrites, the details of which have however been elusive due to the experimental difficulties. Employing the method of restrained thermal expansion, we have studied the effect of isothermal biaxial strain in the basal plane of h-LuFeO 3 (001) films. The results indicate that a compressive biaxial strain significantly enhances the K 3 structural distortion (the order parameter of the improper ferroelectricity), and the effect is larger at higher temperatures. The compressive biaxial strain and the enhanced K 3 structural distortion together, cause an increase in the electric polarization and a reduction in the canting of the weak ferromagnetic moments in h-LuFeO 3, according to our first principle calculations. These findings are important for understanding the strain effect as well as the coupling between the lattice and the improper multiferroicity in h-LuFeO 3. Finally, the experimental elucidation of the strain effect in h-LuFeO 3 films also suggests that the restrained thermal expansion can be a viable method to unravel the strain effect in many other thin film materials.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [6] ;  [5] ;  [5] ;  [3] ;  [2] ;  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Temple Univ., Philadelphia, PA (United States)
  3. Bryn Mawr College, Bryn Mawr, PA (United States)
  4. Univ. of Nebraska, Lincoln, NE (United States); Xi'an Jiaotong Univ., Xi'an (China)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Science Foundation (NSF); National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1372396
Alternate Identifier(s):
OSTI ID: 1347045