The mutual control of the electric and magnetic properties of a multiferroic solid is of fundamental and great technological importance. We report here on the colossal magnetoelectric coupling effect of polycrystalline La0.2Pb0.7Fe12O19. A large classic ferroelectric hysteresis loop with full saturation and a strong magnetic hysteresis loop were observed simultaneously in polycrystalline La0.2Pb0.7Fe12O19 due to the coexistence of an off-centered FeO6 octahedron in its unit cell and electron spins in the partially filled 3d orbits of the Fe3+ ions. The coupling voltage and capacity demonstrate giant oscillations, along with magnetic field; the maximum magnetocapacitance ratio exceeds 1.9E5 at 80 Hz. The substitution of La ions with Pb ions progressively stabilized the conical spin structure, which gave rise to the spin-current induced capacity oscillations upon magnetic field.
@article{arxiv.1603.04508,
title = {Colossal Magnetocapacitance Effect and Multiferroism of Polycrystalline La0.2Pb0.7Fe12O19},
author = {Guo-Long Tan and Hao-Hao Sheng},
journal= {arXiv preprint arXiv:1603.04508},
year = {2016}
}
Comments
The manuscript addresses several significant advances in multiferroic materials, including discovery of the coexistence of large ferroelectricity and strong ferromagnetism as well as colossal magnetocapacitance effect in a new M-type hexaferrite compound: La0.2Pb0.7Fe12O19