Colossal Magnetocapacitance Effect and Multiferroism of Polycrystalline La0.2Pb0.7Fe12O19

TL;DR

This paper reports a colossal magnetocapacitance effect and multiferroism in polycrystalline La0.2Pb0.7Fe12O19, demonstrating giant magnetoelectric coupling and potential for multifunctional device applications.

Contribution

It reveals a giant magnetocapacitance ratio exceeding 1.9E5 and elucidates the role of La/Pb substitution in stabilizing spin structures for enhanced coupling.

Findings

Maximum magnetocapacitance ratio exceeds 1.9E5 at 80 Hz

Giant oscillations in coupling voltage and capacity with magnetic field

Substitution of La with Pb stabilizes spin structures leading to capacity oscillations

Abstract

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.