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    Magnetic Glassy Behavior of Pr<sub>0.6</sub>Ca<sub>0.4</sub>MnO<sub>3</sub> Nanoparticles: Effect of Intra and Interparticle Magnetic Interactions on Magnetodielectric Property

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    Studies of the dc and ac magnetization on Pr<sub>0.6</sub>Ca<sub>0.4</sub>MnO<sub>3</sub> (PCMO) nanoparticles indicate the metastable magnetic behavior with random ferromagnetic and antiferromagnetic interactions that led to spin glass (SG) behavior below 90 K. Magnetodielectric (MD) effect has been investigated by dispersing the SG PCMO nanoparticles in a polyvinylidene fluoride (PVDF) matrix. It is found that for low volume fraction of PCMO the MD varies as <i>M</i><sup>2</sup>, which indicates the intrinsic magnetoelectric (ME) coupling in PCMO nanoparticles. For higher volume fractions (above the percolation threshold) MD goes with the <i>M</i><sup>4</sup>. The magnetization along with microstructural investigations suggested the significant role of inter/intraclusters magnetic interactions on MD property
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