Ferroelectric Switchable Topological Magnon Hall Effect in Type-I Multiferroics

TL;DR

This paper introduces a theoretical framework for controlling magnons in 2D multiferroics via ferroelectric switching, enabling electric manipulation of magnonic Hall effects for low-power spintronic devices.

Contribution

It proposes a novel approach to manipulate magnons through ferroelectric polarization switching in 2D multiferroics, demonstrating reversible control of magnonic Hall effects.

Findings

Ferroelectric switching modulates spin exchanges in monolayer Ti2F3.

Reversal of polarization changes the Berry curvature sign.

Electric control enables nonvolatile, reversible magnon manipulation.

Abstract

Electric control of magnetism at room temperature is crucial for developing next-generation, low-power spintronic devices. However, the intrinsic incompatibility between ferroelectricity and magnetism in crystal symmetry, along with the absence of strong magnetoelectric coupling mechanisms, continues to pose major challenges. In this work, we propose a general theoretical framework for magnon manipulation based on ferroelectric polarization switching in two-dimensional multiferroics. Taking monolayer multiferroics $\mbox{Ti}_{2}\mbox{F}_{3}$ as an example, our calculations demonstrate that ferroelectric switching can significantly modulate spin exchanges, thereby enabling nonvolatile and reversible electric control of the magnons. More importantly, the ferroelectric polarization reversal leads to a sign change in the Berry curvature, ensuring effective control over the valley Hall and nonlinear Hall response of magnons. This study provides a new way for realizing low-power and electrically controllable magnonic devices.