Spin waves in magnetic materials are promising information carriers for future computing technologies due to their ultra-low energy dissipation and long coherence length. Antiferromagnets are strong candidate materials due, in part, to their stability to external fields and larger group velocities. Multiferroic aniferromagnets, such as BiFeO3 (BFO), have an additional degree of freedom stemming from magnetoelectric coupling, allowing for control of the magnetic structure, and thus spin waves, with electric field. Unfortunately, spin-wave propagation in BFO is not well understood due to the complexity of the magnetic structure. In this work, we explore long-range spin transport within an epitaxially engineered, electrically tunable, one-dimensional (1D) magnonic crystal. We discover a striking anisotropy in the spin transport parallel and perpendicular to the 1D crystal axis. Multiscale theory and simulation suggests that this preferential magnon conduction emerges from a combination of a population imbalance in its dispersion, as well as anisotropic structural scattering. This work provides a pathway to electrically-reconfigurable magnonic crystals in antiferromagnets.
@article{arxiv.2402.12341,
title = {Designed spin-texture-lattice to control anisotropic magnon transport in antiferromagnets},
author = {Peter Meisenheimer and Maya Ramesh and Sajid Husain and Isaac Harris and Hyeon Woo Park and Shiyu Zhou and Hossein Taghinejad and Hongrui Zhang and Lane W. Martin and James Analytis and Paul Stevenson and Jorge Íñiguez-González and Se Kwon Kim and Darrell G. Schlom and Lucas Caretta and Zhi Yao and Ramamoorthy Ramesh},
journal= {arXiv preprint arXiv:2402.12341},
year = {2024}
}