A5004492400- Magnetic properties of thin films
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Acoustic Wave Resonator Technologies
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Nanowire Synthesis and Applications
- Quantum and electron transport phenomena
- Magneto-Optical Properties and Applications
- Magnetic Properties and Applications
- Electronic and Structural Properties of Oxides
- Semiconductor Lasers and Optical Devices
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Neuroscience and Neural Engineering
- High-Energy Particle Collisions Research
- Advanced Memory and Neural Computing
- Diamond and Carbon-based Materials Research
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Fiber Optic Sensors
- Nuclear Physics and Applications
- Nanofabrication and Lithography Techniques
- Surface and Thin Film Phenomena
- Ga2O3 and related materials
- Advanced MEMS and NEMS Technologies
Bavarian Academy of Sciences and Humanities
2020-2025
Technical University of Munich
1990-2025
Universität Hamburg
1996-2023
Robert Bosch (Germany)
2022
King's College London
2022
Indian Institute of Technology Madras
2020
Schott (Germany)
2012-2013
Max Planck Institute of Quantum Optics
2003
Leibniz Institute for Analytical Sciences - ISAS
2002
Interuniversity Institute for High Energies
1996
The magnetoelastic coupling of magnetic and elastic excitations enables the generation waves carrying angular momentum. In a quantum picture, this corresponds to resonant conversion magnons chiral phonons vice versa. This study showcases process using simple versatile experimental platform consisting metallic thin film on crystalline substrate. These findings allow us impact crystal symmetry momentum transport by investigate phononic birefringence.
Abstract We investigate the growth of amorphous MoSi thin films using magnetron co-sputtering and optimize conditions with respect to crystal structure superconducting properties (e.g., critical temperature $$T_{\text {c}}$$ ). The deposition pressure, Mo:Si stoichiometry substrate are systematically varied achieve a transition 8.4(3) K for thickness 17.7(8) nm 6.2(9) 4.3(4) thick film. For Mo concentrations above 81% crystalline phase $$\hbox {Mo}_\text {3}$$ <mml:math...
We investigate the injection of quasiparticle spin currents into a superconductor via pumping from an adjacent FM layer.$\;$To this end, we use NbN/\ch{Ni80Fe20}(Py)-heterostructures with Pt sink layer and excite ferromagnetic resonance in Py-layer by placing samples onto coplanar waveguide (CPW). A phase sensitive detection microwave transmission signal is used to quantitatively extract inductive coupling strength between sample CPW, interpreted terms inverse current-induced torques, our...
Excitation functions of proton-proton elastic scattering cross sections have been measured in narrow steps for projectile momenta ${p}_{p}$ (energies ${T}_{p}$) from $1100$ to $3300\mathrm{MeV}/c$ (500 2500 MeV) the angular range $35\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}{\ensuremath{\Theta}}_{\mathrm{c}.\mathrm{m}.}\ensuremath{\le}90\ifmmode^\circ\else\textdegree\fi{}$ with a detector providing...
Tailored magnon-phonon hybrid systems, in which high-overtone bulk acoustic resonators couple resonantly to the Kittel mode of a ferromagnetic thin film, are considered optimal for creation phonons with defined circular polarization. This class devices is therefore ideal investigation phonon-propagation properties and assessing their capacity transport angular momentum classical, potentially even quantum, regime. Here, we study coupling between magnons...
Approaching integrated hybrid neural circuits: Axon guiding on optically active semiconductor microtube arrays. An array of microtubes is utilized to build highly defined networks enabling a remote optical detection action potentials via changing electric field during propagation potentials. The axons in the tubes are detected confocal microscope. As service our authors and readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may be...
We experimentally demonstrate the formation of room-temperature skyrmions with radii about 25\,nm in easy-plane anisotropy multilayers interfacial Dzyaloshinskii-Moriya interaction (DMI). detect individual magnetic by force microscopy and find that are stable out-of-plane fields up to 200 mT. determine interlayer exchange coupling as well strength DMI. Additionally, we investigate dynamic microwave spin excitations broadband resonance spectroscopy. From uniform Kittel mode low damping...
Abstract Planar scanning probe microscopy is a recently emerging alternative approach to tip-based imaging. It can scan an extended planar sensor, such as polished bulk diamond doped with magnetic-field-sensitive nitrogen-vacancy (NV) centers, in nanometer-scale proximity of sample. So far, this technique has been limited optical near-field microscopy, and required nanofabrication the sample interest. Here we extend magnetometry using NV present modification that removes need for sample-side...
Abstract Achieving homogeneous performance metrics between nominally identical pixels is challenging for the operation of arrays superconducting nanowire single‐photon detectors (SNSPDs). Here, local helium ion irradiation utilized to post‐process and tune detection efficiency, switching current, critical temperature individual devices on same chip. For 12 nm thick highly absorptive SNSPDs, which are barely sensitive single photons with a wavelength 780 prior He irradiation, an increase...
Here we present a designer's approach to building cellular neuronal networks based on biocompatible negative photoresist with embedded coaxial feedthroughs made of semiconductor microtubes. The diameter the microtubes is tailored and adjusted cerebellum axons having 2–3 μm. as well SU-8 layer serve topographical cue axons. Apart from guidance, also employ chemical guidance cues enhancing neuron growth at designed spots. Therefore, amino acid poly-l-lysine printed in droplets pl volume front...
SrIrO3 with its large spin–orbit coupling and low charge conductivity has emerged as a potential candidate for efficient torque magnetization control in spintronic devices. Here we report on the influence of an interfacial oxide layer spin pumping experiments Ni80Fe20 (NiFe)/SrIrO3 bilayer heterostructures. To investigate this scenario, have carried out broadband ferromagnetic resonance (BBFMR) measurements, which indicate presence antiferromagnetic layer. We performed in-plane BBFMR at...
Aluminum nitride (AlN) is an emerging material for integrated quantum photonics due to its large χ(2) nonlinearity. Here we demonstrate the hybrid integration of AlN on silicon (SiN) photonic chips. Composite microrings are fabricated by reactive DC sputtering c-axis oriented top pre-patterned SiN. This new approach does not require any patterning and depends only reliable SiN nanofabrication. simplifies nanofabrication process drastically. Optical characteristics, such as quality factor,...
Abstract We systematically study the performance of compact lumped element planar microwave Nb 70 Ti 30 N (NbTiN) resonators operating at 5 GHz in external in-plane magnetic fields up to 440 mT, a broad temperature regime from 2.2 K 13 K, as well mK temperatures. For comparison, have been fabricated on thermally oxidized and pristine, (001) oriented silicon substrates. When multi-photon T = we find internal quality factors Q int ≃ 2 × 10 for NbTiN grown pristine Si In addition, investigate...
Abstract We investigate the growth conditions for thin ( <?CDATA ${\leqslant}200$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mo>⩽</mml:mo> <mml:mn>200</mml:mn> </mml:mrow> </mml:math> nm) sputtered aluminum films. These coatings are needed various applications, e.g. advanced manufacturing processes in aerospace industry or nanostructures quantum devices. Obtaining high-quality films, with low roughness, requires precise optimization of...
InP-based 1.3μm VCSELs employing two dielectric DBRs are presented. Because of reduced internal losses in the DBRs, high slope-efficiencies above 70%, and output-powers 4.8mW reported. The same devices feature modulation bandwidths beyond 12GHz.
Abstract We have optimized the growth of superconducting TaN thin films on SiO 2 substrates via dc magnetron sputtering and extract a maximum transition temperature T c = 5 K as well critical field μ 0 H c2 (13.8 ± 0.1) T. This material is interest for both different fields quantum technology spintronics it represents magnetic field-robust superconductor with strong spin–orbit interaction (SOI). After presenting results optimization, we investigate in second part impact SOI...
For applications making use of magnonic spin currents damping effects, which decrease the conductivity, have to be minimized. We here investigate magnon transport in a yttrium iron garnet thin film with strongly reduced effective magnetization. show that three-terminal device conductivity can increased by factor up six current applied modulator electrode, generates compensation above threshold current. Moreover, we find linear dependence this on magnetic field. explain behavior magnetization...
VCSELs at 1.55-pm with reduced parasitics and improved active region provide superior modulation-bandwidths >10 GHz up to 85°C. These bandwidths enable potential bit-rates of 12.5 or even 17 Gb/s for cost-effective 100G Ethernet solutions.
We present here a novel resist formulation with active thiol groups at the surface. The material is UV curable, and can be patterned micro- nanoscale by nanoimprint lithography. development, its processing, patterning surface characterization are presented here. In addition, possible application, including use to modify electrical properties of graphene devices shown. cured highly transparent, intrinsically hydrophilic made more following UV-ozone or an O2 plasma activation. evaluated...
We investigate the influence of helium ion irradiation on properties NbTiN superconducting single-photon detectors and observe enhanced detector performance. Tailoring design enables that outperform optimized unirradiated detectors.
Low-temperature water electrolysis with a proton exchange membrane (PEM) enables the production of green hydrogen without direct emissions CO 2 . Besides ability to generate at elevated pressure and very high current densities, PEM electrolyzers (PEMWEs) offer load flexibility [1]. This facilitates coupling renewable energy sources opens pathways for large-scale implementation technology. Considering limited supply iridium, efforts target reduced iridium loadings even higher densities while...
The ability to control the Gilbert damping which determines lifetime of spin information is crucial for designing spintronic and magnonic devices. Thus, controlling parameter \ensuremath{\alpha} has been a significant research target several decades. Although numerous approaches have explored \ensuremath{\alpha}, few reports large changes this presented. Herein, we demonstrate change in 2-nm-thick ${\mathrm{Co}}_{25}{\mathrm{Fe}}_{75}$ films originating from uniaxial surface magnetic...
Planar scanning probe microscopy is a recently emerging alternative approach to tip-based imaging. It can scan an extended planar sensor, such as polished bulk diamond doped with magnetic-field-sensitive nitrogen-vacancy (NV) centers, in nanometer-scale proximity of sample. So far, this technique has been limited optical near-field microscopy, and required nanofabrication the sample interest. Here we extend magnetometry using NV present modification that removes need for sample-side...