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Mode selective parametric excitation of spin waves in a Ni81Fe19 microstripe
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematic sample design: A Py microstripe (width w s = 2.5 μm, thickness t s = 40 nm, length l s = 75 μm) is placed on top of a Cu waveguide (width w a = 6 μm, thickness t a = 200 nm) which is connected to a microwave generator. The Cu and the Py are separated by an insulation layer (HSQ) (thickness t = 30 nm). As substrate, an oxidized Si sample is used (t Oxide = 200 nm). An alternating current is passed through the Cu waveguide, creating an alternating Oersted field parallel to the externally applied field H ext.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Normalized BLS spectrum recorded at an applied external field of μ 0 H ext = 55 mT without applied pumping. (b) Calculated dispersion relations (according to Ref. 15) for the transverse spin-wave modes (0; 1, 2, 3, 8, 9).

Image of FIG. 3.
FIG. 3.

(Color online) (a) Color coded BLS intensity at f = 6 GHz for different magnetic fields in a range from 30 mT to 70 mT and different applied microwave powers (15-30 dBm). The black dots (i)-(vi) mark the fields and powers at which transverse mode profiles are recorded. (b) Exemplary cut of (a) for a fixed field μ 0 H ext = 54 mT. (c) Calculated wavevectors15 ky for the modes (0; 1, 2, 3, 8) vs. μ 0 H ext for a fixed frequency of 6 GHz.

Image of FIG. 4.
FIG. 4.

Individually normalized mode profiles recorded along the stripe short axis (see Fig. 1) at the fields and powers indicated by the black dots in Fig. 3(a).


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Scitation: Mode selective parametric excitation of spin waves in a Ni81Fe19 microstripe