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Magnonic crystal wave guide with large spin-wave propagation velocity in CoFeB
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic illustration of the spin-wave spectroscopy setup: microwave tips inject a rf current into coplanar wave guides on top of the sample (light color). The directions of the wave vector and applied external field are depicted. Scanning electron microscopy images of an ADL (b)without and (c) with a magnonic crystal wave guide. The hole diameter (period) is 190 nm (600 nm). The white dashed lines indicate the geometrical width of the MCWG of 1020 nm. (d) Sketch of the band structure for MSFVWs in a square-lattice MC.

Image of FIG. 2.
FIG. 2.

(a) Resonance frequencies at measured in reflection configuration on the plain film (black squares) and ADLs (light symbols) with different defined in the inset. (b) Transmission signal obtained at 1.9 T on the plain film showing oscillatory signals near and . (c) Velocities measured (symbols) and calculated on the basis of Eq. (1) (dashed line) for different ALDs and the plain film, respectively, near [same symbols as in (a)]. (d) Multiple resonances (arrows) of an ADL with MCWGs at 1.82 T. Filled and open symbols stand for excitations at and , respectively. Field dependencies of (e) the two most pronounced modes [mode (I) andmode (II)] and (f) all four resonances at small seen in (d). (g) Transmission signal measured for modes (I) and (II) of the ADL with MCWGs at 1.88 T.

Image of FIG. 3.
FIG. 3.

(a) Simulated spectrum (line) and experimental data (stars) of the ADL with MCWGs at 2.5 T. Spin-precessional amplitudes as simulated for (b) mode (I) and (c) mode (II) seen in the spectrum of (a). The color code for amplitudes is shown on the right.

Image of FIG. 4.
FIG. 4.

(a) Geometry to simulate propagation (thick arrow) in a 41 nm thick magnetic stripe (dark gray). The light shaded area at the left end is excited by a pulse. (b) Simulated (open symbols) and experimental (filled symbols) data of a plain film (squares with broken line), MCWG (diamond), and stripe (triangle).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnonic crystal wave guide with large spin-wave propagation velocity in CoFeB