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Title: Magneto-dielectric coupling and transport properties of the ferromagnetic-BaTiO{sub 3} composites

Ferromagnetic and large magnetoresistance (MR) nanocomposites of La{sub 0.67}Sr{sub 0.33}MnO{sub 3}-BaTiO{sub 3} (LSMO-BTO) are synthesized via sol-gel route. The X-ray diffraction confirms the existence of two chemically separated phases in the composites. The maximum MR (35%) was achieved in LSMO-5% BTO (LB5). The coupling between the coexisting phases is observed from the dielectric anomaly at the ferromagnetic transition (T{sub c} = 353 K) for LB5 composition. We observed maximum magnetodielectric effect at T{sub c} of 1.18% in magnitude for LB5 and the effect of magnetic field on other composites was significant. These results are related to the large spin polarization within grains as well as at the grain boundaries and the evidence of variation in dielectric parameters with magnetic field reveal the magnetoelectric coupling in LSMO-BTO nanocomposites.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [1] ;  [4] ;  [5] ;  [3] ;  [1]
  1. Materials Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005 (India)
  2. (India)
  3. Department of Physics, NSIT, New Delhi 110078 (India)
  4. (China)
  5. AMPRI, CSIR, Bhopal 462026 (India)
Publication Date:
OSTI Identifier:
22412662
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM COMPOUNDS; COUPLING; DIELECTRIC MATERIALS; GRAIN BOUNDARIES; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETORESISTANCE; MANGANATES; NANOCOMPOSITES; SOL-GEL PROCESS; SPIN ORIENTATION; STRONTIUM COMPOUNDS; TITANATES; X-RAY DIFFRACTION