Magnon-Magnon Interaction Induced by Dynamic Coupling in a Hybrid Magnonic Crystal

Sultana, Rawnak; Kaffash, Mojtaba Taghipour; Gubbiotti, Gianluca; Ji, Yi; Jungfleisch, M. Benjamin; Montoncello, Federico

doi:10.1021/acsaelm.5c02128

Magnon-Magnon Interaction Induced by Dynamic Coupling in a Hybrid Magnonic Crystal

Journal Article · Fri Jan 02 00:00:00 EST 2026 · ACS Applied Electronic Materials

DOI:https://doi.org/10.1021/acsaelm.5c02128· OSTI ID:3012952

Sultana, Rawnak ^[1]; Kaffash, Mojtaba Taghipour ^[1]; ^[2]; Ji, Yi ^[1]; ^[1]; ^[3]

University of Delaware, Newark, DE (United States)
CNR-Istituto Officina dei Materiali (IOM), Perugia (Italy)
Università di Ferrara (Italy)

We report a combined experimental and numerical investigation of spin-wave dynamics in a hybrid magnonic crystal consisting of a CoFeB artificial spin ice (ASI) of stadium-shaped nanoelements patterned atop a continuous NiFe film separated by a 5 nm Al₂O₃ spacer. Using Brillouin light scattering spectroscopy, we probe the frequency dependence of thermal spin waves as functions of applied magnetic field and wavevector, revealing the decisive role of interlayer dipolar coupling in the magnetization dynamics. Micromagnetic simulations complement the experiments, showing a strong interplay between ASI edge modes and backward volume modes in the NiFe film. The contrast in saturation magnetization between CoFeB and NiFe enhances this coupling, leading to a pronounced hybridization manifested as a triplet of peaks in the BLS spectra predicted by simulations and observed experimentally. This magnon−magnon coupling persists over a wide magnetic field range, shaping both the spin-wave dispersion at fixed fields and the full frequency-field response throughout the magnetic hysteresis loop. Our findings establish how ASI geometry can selectively enhance specific spin-wave wavelengths in the underlying film, thereby boosting their amplitude and identifying them as preferential channels for spin wave transmission and manipulation.

View Accepted Manuscript (DOE)

Research Organization:: University of Kentucky, Lexington, KY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0024346

OSTI ID:: 3012952

Journal Information:: ACS Applied Electronic Materials, Journal Name: ACS Applied Electronic Materials Journal Issue: 1 Vol. 8; ISSN 2637-6113

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Magnon-Magnon Interaction Induced by Dynamic Coupling in a Hybrid Magnonic Crystal

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