Dielectric, impedance, magnetic and magnetoelectric measurements on YMnO3

Polycrystalline hexagonal Yttrium Manganites (YMnO3) were prepared by solid-state route. X-ray studies revealed the formation of homogenous and single phase material in hexagonal structure. Dielectric, impedance, electrical, magnetic and magnetoelectric measurements were performed on the YMnO3 ceramics. Dielectric and impedance studies show relaxations near 200 degrees C. Complex spectroscopic analysis, in the temperature range of 30-300 degrees C from 1 kHz to 1 MHz, showed non-Debye relaxations. Ac and dc electrical measurements were extracted to understand the transport mechanism: Ac conductivity data is found to obey 'Universal' power law with exponent 0.8. Low temperature magnetization measurements were performed to understand the magnetic nature of the sample. Room temperature magnetoelectric (ME) measurements were also performed and corroborated with the magnetization data.