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Microscopy image of a CoFeB mesa with two integrated coplanar waveguides (CPWs). The center-to-center separation s of the two CPWs is 12 μm. Orientations of in-plane magnetic field H and wave vector k are sketched.
(a) Gray-scale plot of spectra measured on CoFeB at room temperature in transmission configuration between two neighboring coplanar waveguides. The field is collinear with the CPWs. The dashed line indicates 20 mT where we extract the spectrum shown in (b). The spectrum in (b) is the imaginary part of the transmission signal. The frequency separation denoted by is used to calculate the group velocity. The emitter CPW excites two pronounced modes I and II.
(a) Group velocities of DE modes at room temperature as a function of applied field. Filled (open) circles denote CoFeB (permalloy). (b) Spin wave group velocity as a function of angle when the in-plane field amounts to mT.
(a) Imaginary part of the transmission signal obtained on CoFeB when the applied field of 1.9 T is perpendicular to the film plane. indicates the phase shift of 2π acquired by the MSFVWs. (b) Imaginary part of the reflection signal with an applied field of 1.9 T being perpendicular to the film plane. Both spectra were measured at 5 K.
(a) Group velocity measured on CoFeB in a perpendicular field of 1.9 T at different temperatures T. The eigenfrequency varies from 5.6 GHz to 7.2 GHz when T increases from 5 to 295 K. (b) Temperature dependence of intrinsic damping parameter . The inset shows vs f(H) at 295 K. The line reflects Eq. (2) leading to = 0.007.
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