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arXiv · 2411.10903

Symmetry-based phenomenological model for magnon transport in a multiferroic

Isaac A. Harris·Sajid Husain·Peter Meisenheimer·Maya Ramesh·Hyeon Woo Park·Lucas Caretta·Darrell Schlom·Zhi Yao·Lane W. Martin·Jorge Íñiguez-González·Se Kwon Kim·Ramamoorthy Ramesh
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Abstract

Magnons carriers of spin information can be controlled by electric fields in the multiferroic BiFeO$_3$ (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.

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Isaac A. Harris, Sajid Husain, Peter Meisenheimer, Maya Ramesh, Hyeon Woo Park, Lucas Caretta, Darrell Schlom, Zhi Yao, Lane W. Martin, Jorge Íñiguez-González, Se Kwon Kim, Ramamoorthy Ramesh. 2024-11-16. Symmetry-based phenomenological model for magnon transport in a multiferroic. https://arxiv.org/abs/2411.10903

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