  We have studied the magnetic field effect on low frequency dielectric
properties of Pr0.6Ca0.4MnO3/polyvinylidene fluoride nanocomposite with 22.5%
volume fraction of Pr0.6Ca0.4MnO3 nanoparticles. A strong magnetodielectric
response was observed below 120 K where Pr0.6Ca0.4MnO3 nanoparticles show the
magnetic phase transition indicating a direct correlation between magnetism and
dielectric properties. A large change of the dielectric permittivity ~ 30% has
been observed in a magnetic field of 4.6 T with loss as low as 0.17 at 70 K.
The observed magnetodielectric response has been attributed to the decrement of
polaron activation barrier of Pr0.6Ca0.4MnO3 nanoparticles with the increase of
magnetic field.
