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Title: Room temperature ferrimagnetism and ferroelectricity in strained, thin films of BiFe 0.5 Mn 0.5 O 3

Highly strained films of BiFe0.5Mn0.5O₃ (BFMO) grown at very low rates by pulsed laser deposition were demonstrated to exhibit both ferrimagnetism and ferroelectricity at room temperature and above. Magnetisation measurements demonstrated ferrimagnetism (TC ~ 600K), with a room temperature saturation moment (MS) of up to 90 emu/cc (~ 0.58 μB/f.u) on high quality (001) SrTiO₃. X-ray magnetic circular dichroism showed that the ferrimagnetism arose from antiferromagnetically coupled Fe³⁺ and Mn³⁺. While scanning transmission electron microscope studies showed there was no long range ordering of Fe and Mn, the magnetic properties were found to be strongly dependent on the strain state in the films. The magnetism is explained to arise from one of three possible mechanisms with Bi polarization playing a key role. A signature of room temperature ferroelectricity in the films was measured by piezoresponse force microscopy and was confirmed using angular dark field scanning transmission electron microscopy. The demonstration of strain induced, high temperature multiferroism is a promising development for future spintronic and memory applications at room temperature and above.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [4] ;  [4] ;  [5] ;  [6] ;  [2] ;  [7] ;  [8] ;  [9] ;  [10] ;  [1] ;  [4] ;  [1]
  1. Univ. of Cambridge, Cambridge (United Kingdom). Dept. of Materials Science
  2. Rutherford Appleton Lab., Didcot (United Kingdom). ISIS, Science and Technology Facilities Council
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  6. Texas A & M Univ., College Station, TX (United States). Dept. of Electrical and Computer Engineering
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Korea Basic Science Institute, Daejeon (Republic of Korea). Division of Electron Microscopic Research
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  9. Univ. of Glasgow, Glasgow (United Kingdom). SUPA School of Physics and Astronomy
  10. SciTech Daresbury, Warrington (United Kingdom). SuperSTEM
Publication Date:
OSTI Identifier:
1212452
Grant/Contract Number:
AC52-06NA25396; AC02–98CH10886; DMR-1007969; DMR-1401266
Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 24; Journal Issue: 47; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Research Org:
Univ. of Cambridge (United Kingdom)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Engineering and Physical Sciences Research Council; European Research Council
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE multiferroic; ferrimagnetism; ferroelectric; BiFeO3; BiMnO3