Field-free Magnetoacoustic Nonreciprocity via Exchange-bias Engineering
Abstract
Nonreciprocal wave propagation is essential for directional signal processing and isolation. Magnetoacoustic systems are attractive platforms for nonreciprocal devices because of their small footprint and passive operation. However, pronounced nonreciprocity typically requires an external bias field,limiting device miniaturization and integration. Here, we demonstrate field-free magnetoacoustic nonreciprocity in an IrMn/FeGaB/Cu/FeGaB multilayer integrated with a shear-horizontal-wave delay line. Exchange-bias engineering stabilizes a remanent magnetic state with broken time-reversal and spatial-inversion symmetries while tailoring the spin-wave dispersion to achieve resonant magnetoacoustic coupling at zero field. The normalized isolation reaches 21 dB/mm, with its sign programmable by the field-sweep history. Further numerical optimization predicts a zero-field normalized isolation of 91 dB/mm by increasing the dynamical magnetic asymmetry. Our work establishes exchange-bias engineering as a promising route toward compact RF isolators and circulators and as a general strategy for realizing magnetoacoustic devices without external magnetic fields.
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BibTeX
@misc{du2026fieldfree,
title = {{Field-free Magnetoacoustic Nonreciprocity via Exchange-bias Engineering}},
author = {Weiqi Du and Mingyuan Ma and Zheng Sun and Chong Chen and Shixuan Liang and Deqi Tao and Shihai An and Yifan Fu and Sulei Fu and Feng Pan and Cheng Song},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.17979},
eprint = {2610.17979},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.17979},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Field-free Magnetoacoustic Nonreciprocity via Exchange-bias Engineering
AU - Weiqi Du
AU - Mingyuan Ma
AU - Zheng Sun
AU - Chong Chen
AU - Shixuan Liang
AU - Deqi Tao
AU - Shihai An
AU - Yifan Fu
AU - Sulei Fu
AU - Feng Pan
AU - Cheng Song
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2610.17979
UR - https://arxiv.org/abs/2610.17979
AB - Nonreciprocal wave propagation is essential for directional signal processing and isolation. Magnetoacoustic systems are attractive platforms for nonreciprocal devices because of their small footprint and passive operation. However, pronounced nonreciprocity typically requires an external bias field,limiting device miniaturization and integration. Here, we demonstrate field-free magnetoacoustic nonreciprocity in an IrMn/FeGaB/Cu/FeGaB multilayer integrated with a shear-horizontal-wave delay line. Exchange-bias engineering stabilizes a remanent magnetic state with broken time-reversal and spatial-inversion symmetries while tailoring the spin-wave dispersion to achieve resonant magnetoacoustic coupling at zero field. The normalized isolation reaches 21 dB/mm, with its sign programmable by the field-sweep history. Further numerical optimization predicts a zero-field normalized isolation of 91 dB/mm by increasing the dynamical magnetic asymmetry. Our work establishes exchange-bias engineering as a promising route toward compact RF isolators and circulators and as a general strategy for realizing magnetoacoustic devices without external magnetic fields.
ER -