Room-temperature delayed giant magnetodielectric effects observed in Bi4Fe2TiO12 film

TL;DR

This study demonstrates significant magnetodielectric effects at room temperature in Bi4Fe2TiO12 film, caused by magnetic-field-induced spin-orbital coupling that alters dielectric properties reversibly, with potential applications in nanofabrication and integrated devices.

Contribution

First observation of room-temperature giant magnetodielectric effects in Bi4Fe2TiO12 film driven by magnetic-field-induced spin-orbital coupling.

Findings

e' decreases by up to 600 times after magnetic treatment

Effects are reversible with an opposite magnetic field

Potential applications in nanofabrication and integrated photonic devices

Abstract

This letter reports our experimental results on magnetic-field-induced aftereffects in solution derived Bi4Fe2TiO12 film, in which e' decreases as much as 600 times after treated in a 5T magnetic field as that of the pristine one. The phenomena are explained by an unusual spin-orbital coupling in film, where strong magnetic field provides drive force for spin polarized electrons of electrode to enter film, so as to form a ferromagnetic orbital state, increase the relaxation time of defect dipoles and then produce giant magnetodielectric effects. This process is reversible just by applying a opposite 0.5T magnetic field. Our findings have potential applications on magnetic fabrication of nanopatterns somehow to evade nanohazard, as well as on integraged phononic or photonic crystals on chip.