Localized parallel parametric generation of spin waves in a Ni<sub>81</sub>Fe<sub>19</sub> waveguide by spatial variation of the pumping field

Brächer, Thomas; Pirro, Philipp; Heussner, Frank; Serga, Alexander A.; Hillebrands, B.

doi:10.1063/1.4867982

Cited by 17 publications

(16 citation statements)

References 18 publications

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“…As has been shown in Ref. 22, such a geometric variation can be used to modulate the pumping field in space. The Oersted field componenth z arising from the microwave current flowing through the pumping source has been calculated using the COMSOL radiofrequency module for an applied microwave frequency of f ¼ 10 GHz in the continuous wave regime at a distance of dx ¼ 250 nm above the stripline.…”

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confidence: 84%

Parallel parametric amplification of coherently excited propagating spin waves in a microscopic Ni81Fe19 waveguide

Brächer

Pirro

Meyer

et al. 2014

Applied Physics Letters

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We present parallel parametric amplification of coherently excited, propagating spin waves in a microstructured magnonic Ni81Fe19 waveguide. Amplification is achieved by the pumping field generated by a microwave current flowing through a Cu micro-stripline underneath the waveguide. By employing microfocussed Brillouin light scattering spectroscopy, we investigate the spatial decay of the propagating spin waves and their amplification by means of parallel pumping. We analyze the dependence of the intensity of the amplified spin waves on the spin-wave excitation power, pumping power, and pumping duration, revealing the most efficient working point for a noise-free amplification. This paves the way for a frequency selective amplification of spin waves in microstructured magnonic circuits.

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confidence: 84%

Parallel parametric amplification of coherently excited propagating spin waves in a microscopic Ni81Fe19 waveguide

Brächer

Pirro

Meyer

et al. 2014

Applied Physics Letters

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“…The larger current density in this region with smaller cross-section provides a locally enhanced microwave Oersted field. The combination of this local enhancement with the threshold character of parametric amplification results in the actual localization of the parametric spin-wave amplifier [97]. In the experiment in Ref.…”

Section: Local Spin-wave Amplification and Time-and Power-dependence mentioning

confidence: 96%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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Magnonics and magnon spintronics aim at the utilization of spin waves and magnons, their quanta, for the construction of wave-based logic networks via the generation of pure all-magnon spin currents and their interfacing with electrical charge transport. The promise of efficient parallel data processing and low power consumption renders this field one of the most promising research areas in spintronics. In this context, the process of parallel parametric amplification, i.e., the conversion of microwave photons into magnons at one half of the microwave frequency, has proven to be a versatile tool to excite and to manipulate spin waves. Its beneficial and unique properties such as frequency and mode-selectivity, the possibility to excite spin waves in a wide wavevector range and the creation of phase-correlated wave pairs, have enabled the achievement of important milestones like the magnon Bose Einstein condensation and the cloning and trapping of spinwave packets. Parallel parametric amplification, which allows for the selective amplification of magnons while conserving their phase is, thus, one of the key methods of spin-wave generation and amplification.The application of parallel parametric amplification to CMOS-compatible micro-and nanostructures is an important step towards the realization of magnonic networks. This is motivated not only by the fact that amplifiers are an important tool for the construction of any extended logic network but also by the unique properties of parallel parametric amplification. In particular, the creation of phase-correlated wave pairs allows for rewarding alternative logic operations such as a phase-dependent amplification of the incident waves. Recently, the successful application of parallel parametric amplification to metallic microstructures has been reported which constitutes an important milestone for the application of magnonics in practical devices. It has been demonstrated that parametric amplification provides an excellent tool to generate and to amplify spin waves in these systems in a wide wavevector range. In particular, the amplification greatly benefits from the discreteness of the spin-wave spectra since the size of the microstructures is comparable to the spin-wave wavelength. This opens up new, interesting routes of spin-wave amplification and manipulation. In this Review, we will give an overview over the recent developments and achievements in this field.

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“…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%

“…Fig. S3), the wavelength λ s of the excited spin wave at the applied field-frequency-combination was determined to be 13.5 μ m. The extent l p of the localized pumping field is in the range of the spatial extent l n = 6 μ m of the narrowing of the Au strip, since only in this region the threshold of parallel pumping is exceeded37. Hence, the conditions for the non-adiabatic parallel pumping process are fulfilled.…”

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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Localized parallel parametric generation of spin waves in a Ni₈₁Fe₁₉ waveguide by spatial variation of the pumping field

Cited by 17 publications

References 18 publications

Parallel parametric amplification of coherently excited propagating spin waves in a microscopic Ni81Fe19 waveguide

Parallel parametric amplification of coherently excited propagating spin waves in a microscopic Ni81Fe19 waveguide

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

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

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Localized parallel parametric generation of spin waves in a Ni81Fe19 waveguide by spatial variation of the pumping field

Cited by 17 publications

References 18 publications

Parallel parametric amplification of coherently excited propagating spin waves in a microscopic Ni81Fe19 waveguide

Parallel parametric amplification of coherently excited propagating spin waves in a microscopic Ni81Fe19 waveguide

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

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

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Localized parallel parametric generation of spin waves in a Ni₈₁Fe₁₉ waveguide by spatial variation of the pumping field