# Electric field control of terahertz polarization in a multiferroic manganite with electromagnons

## TL;DR

This study demonstrates the all-electrical control of terahertz polarization in a multiferroic manganite through electromagnons, enabling dynamic tuning of terahertz light polarization via magnetoelectric coupling.

## Contribution

It introduces a method to electrically manipulate terahertz polarization in a multiferroic material using electromagnons, showcasing dynamic control of the magnetoelectric effect.

## Key findings

- Terahertz polarization rotation can be controlled by ferroelectric domain orientation.
- Voltage can switch the amplitude and direction of polarization rotation.
- The dynamic magnetoelectric effect enables tunable terahertz polarization.

## Abstract

All-electrical control of a dynamic magnetoelectric effect is demonstrated in a classical multiferroic manganite DyMnO3, a material containing coupled antiferromagnetic and ferroelectric orders. Due to intrinsic magnetoelectric coupling with electromagnons a linearly polarized terahertz light rotates upon passing through the sample. The amplitude and the direction of the polarization rotation are defined by the orientation of ferroelectric domains and can be switched by static voltage. These experiments allow the terahertz polarization to be tuned using the dynamic magnetoelectric effect.