Magnons carriers of spin information can be controlled by electric fields in the multiferroic BiFeO3 (BFO), a milestone that brings magnons closer to application in future devices. The origin of magnon-spin currents in BFO, however, is not fully understood due to BFO's complicated magnetic texture. In this letter, we present a phenomenological model to elucidate the existence of magnon spin currents in generalized multiferroics by examining the symmetries inherent to their magnetic and polar structures. This model is grounded in experimental data obtained from BFO and its derivatives, which informs the symmetry operations and resultant magnon behavior. By doing so, we address the issue of symmetry-allowed, switchable magnon spin transport in multiferroics, thereby establishing a critical framework for comprehending magnon transport within complex magnetic textures.
@article{arxiv.2411.10903,
title = {Symmetry-based phenomenological model for magnon transport in a multiferroic},
author = {Isaac A. Harris and Sajid Husain and Peter Meisenheimer and Maya Ramesh and Hyeon Woo Park and Lucas Caretta and Darrell Schlom and Zhi Yao and Lane W. Martin and Jorge Íñiguez-González and Se Kwon Kim and Ramamoorthy Ramesh},
journal= {arXiv preprint arXiv:2411.10903},
year = {2024}
}