Magnetoelectricity in CoFe2O4 nanocrystal-P(VDF-HFP) thin films
- 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
- 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
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- City College of New York, NY (United States). Dept. of Physics
- City College of New York, NY (United States). Department of Mechanical Engineering
- City College of New York, NY (United States). Dept. of Mechanical Engineering
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 Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- Grant/Contract Number:
- AR0000114; 0833180; AC02-98CH10886
- OSTI ID:
- 1629166
- Journal Information:
- Nanoscale Research Letters (Online), Vol. 8, Issue 1; ISSN 1556-276X
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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