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Magnetoelectricity in CoFe2O4 nanocrystal-P(VDF-HFP) thin films

Journal Article · · Nanoscale Research Letters (Online)
 [1];  [2];  [3];  [4];  [4];  [5];  [3];  [6];  [7]
  1. City College of New York, NY (United States). Dept. of Chemistry; City Univ. of New York (CUNY), NY (United States). Energy Institute; The Graduate Center of City Univ. of New York (CUNY), NY (United States). Department of Chemistry; DOE/OSTI
  2. City College of New York, NY (United States). Dept. of Chemistry and Department of Mechanical Engineering; City Univ. of New York (CUNY), NY (United States). Energy Institute
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. City College of New York, NY (United States). Dept. of Physics
  5. City College of New York, NY (United States). Department of Mechanical Engineering
  6. City College of New York, NY (United States). Dept. of Mechanical Engineering
  7. City College of New York, NY (United States). Dept. of Chemistry; City Univ. of New York (CUNY), NY (United States). Energy Institute; The Graduate Center of City Univ. of New York (CUNY), NY (United States). Department of Chemistry
Transition metal ferrites such as CoFe2O4, possessing a large magnetostriction coefficient and high Curie temperature (Tc > 600 K), are excellent candidates for creating magnetic order at the nanoscale and provide a pathway to the fabrication of uniform particle-matrix films with optimized potential for magnetoelectric coupling. Here, a series of 0–3 type nanocomposite thin films composed of ferrimagnetic cobalt ferrite nanocrystals (8 to 18 nm) and a ferroelectric/ piezoelectric polymer poly(vinylidene fluoride-co-hexafluoropropene), P(VDF-HFP), were prepared by multiple spin coating and cast coating over a thickness range of 200 nm to 1.6 μm. We describe the synthesis and structural characterization of the nanocrystals and composite films by XRD, TEM, HRTEM, STEM, and SEM, as well as dielectric and magnetic properties, in order to identify evidence of cooperative interactions between the two phases. The CoFe2O4 polymer nanocomposite thin films exhibit composition-dependent effective permittivity, loss tangent, and specific saturation magnetization (Ms). An enhancement of the effective permittivity and saturation magnetization of the CoFe2O4-P(VDF-HFP) films was observed and directly compared with CoFe2O4-polyvinylpyrrolidone, a non-ferroelectric polymer-based nanocomposite prepared by the same method. The comparison provided evidence for the observation of a magnetoelectric effect in the case of CoFe2O4-P(VDF-HFP), attributed to a magnetostrictive/piezoelectric interaction. An enhancement of Ms up to +20.7% was observed at room temperature in the case of the 10 wt.% CoFe2O4-P(VDF-HFP) sample.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-98CH10886; AR0000114
OSTI ID:
1629166
Journal Information:
Nanoscale Research Letters (Online), Journal Name: Nanoscale Research Letters (Online) Journal Issue: 1 Vol. 8; ISSN 1556-276X
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Optimization of dielectric properties of PVDF-CFO nanocomposites journal November 2018
A flexible magnetoelectric field-effect transistor with magnetically responsive nanohybrid gate dielectric layer journal September 2015
Hollandites as a new class of multiferroics journal August 2014
Solvent-assisted optimal BaTiO 3 nanoparticles-polymer composite cluster formation for high performance piezoelectric nanogenerators journal November 2014
Ultra-Sensitive Strain Sensor Based on Flexible Poly(vinylidene fluoride) Piezoelectric Film journal March 2018

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