Time- and power-dependent operation of a parametric spin-wave amplifier

Brächer, Thomas; Heussner, Frank; Pirro, Philipp; Fischer, Tobias; Geilen, Moritz; Heinz, Björn; Lägel, B.; Serga, Alexander A.; Hillebrands, B.

doi:10.1063/1.4904078

Cited by 33 publications

(25 citation statements)

References 17 publications

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“…An example for time-resolved BLS microscopy can be found in Brächer et al [124]. In this experiment, Brächer et al demonstrated the active amplification of propagating spin waves in a Ni 81 Fe 19 waveguide using parametric pumping.…”

Section: Temporal Analysismentioning

confidence: 99%

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Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

et al. 2015

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Spin waves are the elementary excitations of the spin system in a magnetically ordered material state and magnons are their quasi particles. In the following article, we will discuss Brillouin light scattering (BLS) spectroscopy which is now a well-established tool for the characterization of spin waves. BLS is the inelastic scattering of light from spin waves and confers several benefits: the ability to map the spin-wave intensity with spatial resolution and high sensitivity as well as the potential for the simultaneous detection of frequency and wave vector. For several decades, the field of spin waves gained huge interest by the scientific community due to its relevance regarding fundamental issues in spin dynamics. Recently, the ongoing research in the field of magnonics has put particular emphasis on the high potential of spin waves regarding information technology. Opposed to charge-based schemes in conventional electronics and spintronics, magnons are charge-free currents of angular momentum, and, therefore, less subject to dissipative scattering processes. These ideas have propelled the quest for concepts to guide and manipulate spin-wave transport as well as for the miniaturization of spin-wave conduits towards sub-micrometer dimensions. For the further development of potential spin-wave-based devices, the ability to directly observe spin-wave propagation with spatial resolution is crucial. As an optical technique, BLS allows for a sub-micron space resolution by the implementation of a microscope objective in the optical setup. Over the last decade, this micro-focus BLS technique has become an established method for the investigation of spin waves in microstructured magnetic elements and proved its value in particular regarding magnonics. In this article, we will discuss the basic principles of BLS and illustrate the experimental optical setup. Particular emphasis will be put on the implementation of the high spatial resolution of BLS microscopes as well as on their computer based operation and automated sample positioning. Owing to these improvements in ease of use as well as experimental applicability, the BLS technique has maintained its relevance for investigations on spin waves in miniaturized magnetic structures as will be illustrated by a selection of experiments.

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Section: Temporal Analysismentioning

confidence: 99%

“…(B) Time-resolved BLS measurement of spin-wave pulses amplified via parametric pumping in a microstructured Ni 81 Fe 19 waveguide [124].…”

Section: Figure 15 | (A)mentioning

confidence: 99%

Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

et al. 2015

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“…The notable difference of the intensity in front of the amplifier by about ±35% is likely mediated due to the interference of the incoming signal spin waves with spin waves reflected during their propagation past the amplifier or with spin waves created by a weak amplification of counterpropagating waves. For completeness, the red circles show the intensity arising if only parallel pumping is applied, which leads to the amplification of thermal spin waves, a process known as parametric generation363839. As can be seen from the figure, for the given pumping power and pulse duration, no rise of the BLS intensity within the amplifier due to parametric generation is noticeable.…”

Section: Demonstration Of the Phase-to-intensity Conversionmentioning

confidence: 99%

“…This leads to a strong spatial localization of the pumping process which provides the needed effective wave vector k p . Thus, this region is the actual local parametric amplifier3637.…”

Section: Demonstration Of the Phase-to-intensity Conversionmentioning

confidence: 99%

Phase-to-intensity conversion of magnonic spin currents and application to the design of a majority gate

Brächer

Heussner

Pirro

et al. 2016

Sci Rep

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Magnonic spin currents in the form of spin waves and their quanta, magnons, are a promising candidate for a new generation of wave-based logic devices beyond CMOS, where information is encoded in the phase of travelling spin-wave packets. The direct readout of this phase on a chip is of vital importance to couple magnonic circuits to conventional CMOS electronics. Here, we present the conversion of the spin-wave phase into a spin-wave intensity by local non-adiabatic parallel pumping in a microstructure. This conversion takes place within the spin-wave system itself and the resulting spin-wave intensity can be conveniently transformed into a DC voltage. We also demonstrate how the phase-to-intensity conversion can be used to extract the majority information from an all-magnonic majority gate. This conversion method promises a convenient readout of the magnon phase in future magnon-based devices.

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“…Consequently, the losses of the resonator are dominated by the propagation loss. In order to counteract these losses, we employ parametric amplification, also known as parallel pumping [16][17][18][19] . In this technique, the system is pumped at the frequency f p which equals twice the resonance frequency f .…”

Section: Layout and Working Principlementioning

confidence: 99%

An analog magnon adder for all-magnonic neurons

Brächer

Pirro

2018

Journal of Applied Physics

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Spin-waves are excellent data carriers with a perspective use in neuronal networks: Their lifetime gives the spin-wave system an intrinsic memory, they feature strong nonlinearity, and they can be guided and steered through extended magnonic networks. In this work, we present a magnon adder that integrates over incoming spin-wave pulses in an analog fashion. Such an adder is a linear prequel to a magnonic neuron, which would integrate over the incoming pulses until a certain nonlinearity is reached. In this work, the adder is realized by a resonator in combination with a parametric amplifier which is just compensating the resonator losses.

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Time- and power-dependent operation of a parametric spin-wave amplifier

Cited by 33 publications

References 17 publications

Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

Micro-focused Brillouin light scattering: imaging spin waves at the nanoscale

Phase-to-intensity conversion of magnonic spin currents and application to the design of a majority gate

An analog magnon adder for all-magnonic neurons

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