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<strong>Multiferroic properties of polyvinyledene fluoride/nickel nano-composites</strong>

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Title Statement <strong>Multiferroic properties of polyvinyledene fluoride/nickel nano-composites</strong>
 
Added Entry - Uncontrolled Name Panda, Maheswar ; Dr. Hari Singh Gour Central University, Sagar
 
Uncontrolled Index Term Experimental condensed matter Physics
Composite materials; Percolation; Critical exponent; Permeability; Multiferroic
 
Summary, etc. Electrical and magnetic properties of ferroelectric polymer (polyvinyledene fluoride) and ferromagnetic metal [nanocrystalline nickel (<em>nc</em>-Ni)] composites have been investigated as a function of volume fractions of <em>nc</em>-Ni (<em>f<sub>Ni</sub></em>). A significant enhancement in saturation magnetization of 24 emu/g, measure of permeability (μ') of 1.11 and dielectric constant of 2050 at 100 Hz has been observed at the electrical percolation threshold (<em>f<sub>c</sub></em>) of the composite. The critical exponents (<em>x</em> and <em>y</em>) obtained are within the universal regime. The decrease of magnetization of the composite with decrease in<em> f<sub>Ni</sub></em> is attributed to the dilution effect and magnetic dipolar exchange interaction. The constancy of coercive field (<em>H</em><sub>c</sub>) has been explained on the basis of Stoner-Wohlfarth model. The value of μ' increases linearly with increase of <em>f<sub>Ni</sub></em> as the magnetic flux concentrates over individual <em>n<sub>c</sub></em>-Ni clusters/particles even beyond <em>f<sub>c</sub></em>. On the other hand, the value of μ' decreases for pure <em>n<sub>c</sub></em>-Ni probably due to the increased connectivity among the <em>n<sub>c</sub></em>-Ni clusters/particles and hence being a conductor results in eddy current generation in alternating magnetic field. The enhancement of dielectric constant near <em>f<sub>c</sub></em> is explained with the help of boundary layer capacitor effect.
 
Publication, Distribution, Etc. Indian Journal of Pure & Applied Physics (IJPAP)
2016-02-22 13:16:04
 
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http://op.niscair.res.in/index.php/IJPAP/article/view/3768
 
Data Source Entry Indian Journal of Pure & Applied Physics (IJPAP); ##issue.vol## 54, ##issue.no## 2 (2016): Indian Journal of Pure & Applied Physics
 
Language Note en
 
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