Abstract
The ferromagnetic resonance (FMR) properties of ferromagnetic films play an important role in microwave magnetic devices. Currently, micropatterning of ferromagnetic films is utilized to arbitrarily design the FMR performance, with one‐dimensional control being primarily considered. This work develops a two‐dimensional permalloy microstructure array as a controllable design for biaxial magnetic anisotropy and multimodal FMR tuning. Under a magnetic field with a fixed angle, the microstructure containing stripe domains generates both a high‐frequency optical branch (4.1 GHz) and a low‐frequency acoustic branch (2.28 GHz) simultaneously. By adjusting the width of the microstrips that compose the permalloy microgrid array, both the frequency and the transition field of the acoustic and optical branches can be tuned. Furthermore, selective control of the desired resonance mode is achieved by changing the microstrip width in a single direction. This controllable design, featuring coexisting acoustic and optical branches, provides a new approach for the development of multichannel electromagnetic shielding and high‐frequency magnetic devices.
Published Version
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