Magnetic, dielectric, magnetoelectric, and microstructural studies demonstrating improved magnetoelectric sensitivity in three-phase BaTiO{sub 3}-CoFe{sub 2}O{sub 4}-poly(vinylidene-fluoride) composite

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3181061· OSTI ID:21359331

Gupta, Arti; Chatterjee, Ratnamala ^[1]

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1. Department of Physics, Advanced Ceramic Lab, Indian Institute of Technology, New Delhi 110016 (India)

A three-phase BaTiO{sub 3}-CoFe{sub 2}O{sub 4}-poly(vinylidene-fluoride) (BT-CF-PVDF) particulate composite showing a maximum magnetoelectric voltage coefficient alpha{sub E33}approx26 mV/cm Oe, at a small applied magnetic field H{sub DC}=263 Oe, has been demonstrated in this work. Large magnetoelectric response in this composite (particulate BT-CF embedded in PVDF matrix) is possibly a result of the effective mechanical interaction between CF and BT through the PVDF matrix. Processing temperatures for composite preparation are low, ensuring no chemical reaction or interdiffusion between the atoms of piezoelectric and magnetostrictive phases, leading to large value of magnetoelectric voltage coefficient. Detailed measurements of dielectric, magnetic, and static magnetoelectric data are reported. Peak in the dielectric spectrum is shown to correlate with the buildup of magnetization in the composite. Although the M-H loop gives M{sub s}, M{sub r}, and H{sub c} (=37.2 emu/g, 16.4 emu/g, and 830 Oe, respectively) in accordance with the expected values (wt % of CF in the composite is 52.5%), the overall magnetic behavior of the composite is identified as 'spin glass'.

• OSTI ID: 21359331
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 2 Vol. 106; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
ELECTRICITY
HYSTERESIS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETOSTRICTION
MATERIALS
MICROSTRUCTURE
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PIEZOELECTRICITY
POLYMERS
POLYVINYLS
SPIN GLASS STATE
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS