Spin-wave (SW) propagation was studied in periodic arrays of 120 nm large holes, so called antidot lattices (ADLs). They were created by focused ion beam lithography into 25 nm thin permalloy Ni80Fe20 films. GHz SW spectroscopy was performed all electrically by micro- and nanoscale coplanar waveguides. The ADL periodicity ranged from 300 to 800 nm. For 300 nm periodicity, coherent backscattering was found to cause magnonic miniband formation in the SW dispersion and large group velocities of 6 km/s. For 800 nm periodicity and long SW wave lengths, the ADL showed signatures of an unstructured plain film with effective properties, i.e. metamaterial behavior. These effectively continuous properties were also found to describe well SW transmission into the ADL.
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Spin-wave (SW) propagation was studied in periodic arrays of 120 nm large holes, so called antidot lattices (ADLs). They were created by focused ion beam lithography into 25 nm thin permalloy Ni80Fe20 films. GHz SW spectroscopy was performed all electrically by micro- and nanoscale coplanar waveguides. The ADL periodicity ranged from 300 to 800 nm. For 300 nm periodicity, coherent backscattering was found to cause magnonic miniband formation in the SW dispersion and large group velocities of 6 k...
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