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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Abstract
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
