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(Color online) (a) An optical micrograph of a representative device. (b) A square wave input produces Gaussian spin wave packets at both the rising and falling edges. (c) Contour plot of measured spin wave packets as a function of the bias field (Hb ) for a 100 ps pulse excitation. The scale bar is in millivolt. (d) The change in spin wave frequency as a function of Hb .
(Color online) (a) Line plots of Gaussian wave packets due to the rising and falling edge of a unipolar voltage pulse for the various pulse widths, tδ showing constructive (red thin lines) or destructive (blue thick lines) interferences. (b) Contour plot showing the two Gaussian wave packets as a function of tδ . (c) A section of (b) zoomed in to reveal the interference. (d), (e), and (f) are plots corresponding to (a), (b), and (c) for a bipolar pulse, respectively. The scale bar is in millivolt.
(Color online) The Mx /Ms component (a) and the time response of the spin wave for different tδ (b) with a 2 kOe out-of-plane bias field. The Mx /Ms component (c) and the spin wave for different tδ (d) with a 1 kOe in-plane bias field along the nanowire.
(Color online) (a) The contour plot of spin waves generated from the rising and falling edges of a unipolar square pulse with different tδ . (b) The amplitude of the frequency spectrum of a square pulse with different tδ , at the resonance frequency f of 1.5 GHz.
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