A micro-sized parametric spin-wave amplifier

Abstract

We present the experimental observation of the localized amplification of externally excited spin waves in a transversely in-plane magnetized Ni${}_{81}$Fe${}_{19}$ magnonic waveguide by means of parallel pumping. By employing microfocussed Brillouin light scattering spectroscopy, we analyze the dependency of the amplification on the applied pumping power and on the delay between the input spin-wave packet and the pumping pulse. We show that there are two different operation regimes: At large pumping powers, the spin-wave packet needs to enter the amplifier before the pumping is switched on in order to be amplified while at low powers the spin-wave packet can arrive at any time during the pumping pulse.

11 pages, 3 figures

References in corpus (3)

• Realization of XNOR and NAND spin-wave logic gates
• The 2014 Magnetism Roadmap
• Spin-wave excitation and propagation in microstructured waveguides of yttrium iron garnet (YIG)/Pt bilayers

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• An Introduction to Spin Wave Computing
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• Stimulated Thermalization of a Parametrically Driven Magnon Gas as a Prerequisite for Bose-Einstein Magnon Condensation
• Confinement of Bose-Einstein magnon condensates in adjustable complex magnetization landscapes
• Numerical reverse engineering of general spin-wave dispersions: Bridge between numerics and analytics using a dynamic-matrix approach