Dissipationless Multiferroic Magnonics

TL;DR

This paper introduces a method for dissipationless magnonic control in multiferroic insulators using the magnetoelectric effect, enabling low-energy, room-temperature spin-based electricity transmission without damping losses.

Contribution

It demonstrates electrically controlled, dissipationless magnonic spin transport in multiferroic insulators via Goldstone modes activated by low-frequency electric fields.

Findings

Goldstone modes enable fast spin rotations without crystalline anisotropy obstruction

Electric fields as low as household frequency can activate these modes

Potential for energy-efficient, room-temperature spintronic devices

Abstract

We propose that the magnetoelectric effect in multiferroic insulators with coplanar antiferromagnetic spiral order, such as BiFeO$_{3}$, enables electrically controlled dissipationless magnonics. Applying an oscillating electric field in these materials with frequency as low as household frequency can activate Goldstone modes that manifests fast planar rotations of spins, whose motion is not obstructed by crystalline anisotropy. Combining with spin ejection mechanisms, such a fast planar rotation can deliver electricity at room temperature over a distance of the magnetic domain, which is free from the energy loss due to Gilbert damping.