Matthias Küß*, , , Stephan Glamsch, , , Aria Arabzadeh, , , Andreas Hörner, , , Gaspare Varvaro, , and , Manfred Albrecht,
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Nonreciprocal Transmission of Surface Acoustic Waves in CoFeB/Si3N4/CoFeB Heterostructures with Noncollinear Layer Magnetizations
We explore an innovative approach to create an acoustic isolator, which is based on the interaction between surface acoustic waves (SAWs) and spin waves (SWs) in a hybrid made out of a piezoelectric crystal and a ferromagnetic/nonmagnetic/ferromagnetic thin film. Our experimental study confirms the predictions of a recent theoretical work [L. Ushii, Phys. Rev. Appl. 22, 034046 (2024)] in which the noncollinear magnetization configuration has been identified as the state of the potentially largest SAW-SW coupling with a sufficiently large nonreciprocal SW dispersion giving rise to a large nonreciprocal SAW transmission. The noncollinear configuration of the two magnetic layers is stabilized by magnetic in-plane anisotropies that are aligned perpendicular to each other and were induced by oblique sputter deposition. For our samples with a 150 μm long CoFeB (22 nm)/Si3N4 (5 nm)/CoFeB (22 nm) thin film, we demonstrate a large isolation of more than 25 dB at 2–3 GHz and reasonable robustness in the working characteristics against deviations in the magnetic anisotropy and external field directions.
期刊介绍：
ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric.
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