Ádám Papp
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View article: Identification and minimization of losses in microscaled spin-wave transducers
Identification and minimization of losses in microscaled spin-wave transducers Open
Magnonics is a promising platform for integrated radio frequency (rf) devices, leveraging its inherent non-reciprocity and reconfigurability. However, the efficiency of spin-wave transducers driven by rf-currents remains a major challenge.…
View article: Design rules for low-insertion-loss magnonic transducers
Design rules for low-insertion-loss magnonic transducers Open
We present a computational framework for the design of magnonic transducers, where waveguide antennas generate and pick up spin-wave signals. Our method relies on the combination of circuit-level models with micromagnetic simulations and a…
View article: The effect of Ga-ion irradiation on sub-micron-wavelength spin waves in yttrium-iron-garnet films
The effect of Ga-ion irradiation on sub-micron-wavelength spin waves in yttrium-iron-garnet films Open
We investigate the effect of focused-ion-beam (FIB) irradiation on spin waves with sub-micron wavelengths in yttrium-iron-garnet films. Time-resolved scanning transmission x-ray microscopy was used to image the spin waves in irradiated reg…
View article: Design rules for low-insertion-loss magnonic transducers
Design rules for low-insertion-loss magnonic transducers Open
We present a computational framework for the design of magnonic transducers, where waveguide antennas generate and pick up spin-wave signals. Our method relies on the combination of circuit-level models with micromagnetic simulations and a…
View article: The Effect of Ga-Ion Irradiation on Sub-Micron-Wavelength Spin Waves in Yttrium-Iron-Garnet Films
The Effect of Ga-Ion Irradiation on Sub-Micron-Wavelength Spin Waves in Yttrium-Iron-Garnet Films Open
We investigate the effect of focused-ion-beam (FIB) irradiation on spin waves with sub-micron wavelengths in Yttrium-Iron-Garnet (YIG) films. Time-resolved scanning transmission X-ray (TR-STXM) microscopy was used to image the spin waves i…
View article: Secondary Excitation of Spin-Waves: How Electromagnetic Cross-Talk Impacts on Magnonic Devices
Secondary Excitation of Spin-Waves: How Electromagnetic Cross-Talk Impacts on Magnonic Devices Open
This work examines the impact of electromagnetic cross-talk in magnonic devices when using inductive spin-wave (SW) transducers. We present detailed electrical SW spectroscopy measurements showing the signal contributions to be considered …
View article: Spin‐Wave Optics in YIG Realized by Ion‐Beam Irradiation
Spin‐Wave Optics in YIG Realized by Ion‐Beam Irradiation Open
Direct focused‐ion‐beam writing is presented as an enabling technology for realizing functional spin‐wave devices of high complexity, and demonstrate its potential by optically‐inspired designs. It is shown that ion‐beam irradiation change…
View article: Experimental Demonstration of a Spin-Wave Lens Designed with Machine Learning
Experimental Demonstration of a Spin-Wave Lens Designed with Machine Learning Open
We present the design and experimental realization of a device that acts like a spin-wave lens i.e., it focuses spin waves to a specified location. The structure of the lens does not resemble any conventional lens design, it is a nonintuit…
View article: Spin-Wave Optics in YIG by Ion-Beam Irradiation
Spin-Wave Optics in YIG by Ion-Beam Irradiation Open
We demonstrate direct focused ion beam (FIB) writing as an enabling technology for realizing spin-wave-optics devices. It is shown that ion-beam irradiation changes the characteristics of YIG films on a submicron scale in a highly controll…
View article: Coal-fired power plants in the crossfire of the European Union's energy and climate policy
Coal-fired power plants in the crossfire of the European Union's energy and climate policy Open
For decades, the European Union has taken decisive actions through its energy and climate policy in order to shift its energy mix from fossil fuels to renewable energy sources. In 2017 the policymakers decided to remove coal from the energ…
View article: Advances in Magnetics Roadmap on Spin-Wave Computing
Advances in Magnetics Roadmap on Spin-Wave Computing Open
We acknowledge funding by the DFG (#423441604 and SFB TRR 173 Spin+X projects A01 and B02 #268565370), and KAUST (Project No. OSR-2019-CRG8-4048.2). This work has received funding from the European Union’s Horizon 2020 research and innovat…
View article: Experimental Demonstration of a Spin-Wave Lens Designed With Machine Learning
Experimental Demonstration of a Spin-Wave Lens Designed With Machine Learning Open
We present the design and experimental realization of a device that acts like a spin-wave lens i.e., it focuses spin waves to a specified location. The structure of the lens does not resemble any conventional lens design, it is a nonintuit…
View article: Nanoscale neural network using non-linear spin-wave interference
Nanoscale neural network using non-linear spin-wave interference Open
We demonstrate the design of a neural network hardware, where all neuromorphic computing functions, including signal routing and nonlinear activation are performed by spin-wave propagation and interference. Weights and interconnections of …
View article: Experimental Demonstration of a Rowland Spectrometer for Spin Waves
Experimental Demonstration of a Rowland Spectrometer for Spin Waves Open
We experimentally demonstrate the operation of a spin-wave Rowland spectrometer. In the proposed device geometry, spin waves are coherently excited on a diffraction grating and form an interference pattern that spatially separates spectral…
View article: Automatic Annotation of Hyperspectral Images and Spectral Signal Classification of People and Vehicles in Areas of Dense Vegetation with Deep Learning
Automatic Annotation of Hyperspectral Images and Spectral Signal Classification of People and Vehicles in Areas of Dense Vegetation with Deep Learning Open
Despite recent advances in image and video processing, the detection of people or cars in areas of dense vegetation is still challenging due to landscape, illumination changes and strong occlusion. In this paper, we address this problem wi…
View article: Real-Time Train Tracking from Distributed Acoustic Sensing Data
Real-Time Train Tracking from Distributed Acoustic Sensing Data Open
In the context of railway safety, it is crucial to know the positions of all trains moving along the infrastructure. In this contribution, we present an algorithm that extracts the positions of moving trains for a given point in time from …
View article: Train tracking and train condition monitoring by Distributed Acoustic Sensing
Train tracking and train condition monitoring by Distributed Acoustic Sensing Open
In this technical contribution we present the potential of Distributed Acoustic Sensing (DAS) for monitoring railway tracks and rolling stock. DAS is a measuring technique that allows to sense pressure changes in an optical fiber through s…