A5027026057- Acoustic Wave Resonator Technologies
- Magnetic Field Sensors Techniques
- Magnetic properties of thin films
- Multiferroics and related materials
- Magneto-Optical Properties and Applications
- Ferroelectric and Piezoelectric Materials
- Metal Alloys Wear and Properties
- High Entropy Alloys Studies
- Non-Destructive Testing Techniques
- Copper Interconnects and Reliability
- Adhesion, Friction, and Surface Interactions
- Electrical and Bioimpedance Tomography
- Modular Robots and Swarm Intelligence
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Geophysical and Geoelectrical Methods
- nanoparticles nucleation surface interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Shape Memory Alloy Transformations
- Ultrasonics and Acoustic Wave Propagation
- Semiconductor materials and devices
- ZnO doping and properties
- Atomic and Subatomic Physics Research
- Characterization and Applications of Magnetic Nanoparticles
- Metallic Glasses and Amorphous Alloys
Kiel University
2019-2024
Fachhochschule Kiel
2019-2023
In principle, electrode-based bioelectrical signal acquisition can be complemented by biomagnetic sensing and therefore requires a more detailed assessment, especially because of the availability novel noncryogenic sensor technologies. The current development thin-film magnetoelectric (ME) sensors ensures that ME technology is becoming prospective candidate for biomagnetometry. main obstacle large-scale usage lack extremely low noise floors at final system output. This article highlights...
In the development of any type magnetic field sensor based on films, special consideration must be given to layer component. The presented work investigates use scalable flux closing magnetostrictive multilayers for inverse magnetoelectric sensors. such a sensor, highly sensitive AC and DC detection relies strong excitation incorporated layers by piezoelectrically driven cantilever oscillation at mechanical resonances. provoked periodic change is influenced measured picked up coil, which...
Surface acoustic wave magnetic field sensors based on guided Love waves using the ΔE effect of a magnetostrictive thin film have been shown to be promising candidates for measurement weak fields at low frequencies as required biomagnetic applications or current benefitting from large dynamic range and bandwidth. The deposition soft films with high magnetostriction is, however, more challenging piezoelectric substrates such quartz than silicon. Thermally induced anisotropic expansion during...
This study investigates the impact of deep cryogenic treatment (DCT) on microstructure and properties a martensitic stainless steel AISI 431. The reasonably simplistic tailoring with DCT delivers novel pathway towards advanced 3rd generation high-strength steels (AHSS), whilst utilizing existing alloys chemistry. resulting microstructural changes deliver improved strength hardness material, still sustaining good elongation properties. reduces material's toughness but improves its deformation...
High sensitivity magnetoelectric (ME) thin film composite sensors, which enable the detection of picotesla magnetic fields, are improved in terms noise performance by elimination domain (MD) activity. Using an antiparallel (AP) exchange biasing scheme, suppression is obtained. Postsetting AP biased ferromagnetic/antiferromagnetic multilayers accomplished field free annealing with in-situ MD control. Overcoming shape and demagnetization effects, stable single configurations sensing layers...
In this work, the first surface acoustic-wave-based magnetic field sensor using thin-film AlScN as piezoelectric material deposited on a silicon substrate is presented. The fabrication based standard semiconductor technology. acoustically active area consists of an layer that can be excited with interdigital transducers, smoothing SiO2 layer, and magnetostrictive FeCoSiB film. detection limit 2.4 nT/Hz at 10 Hz 72 pT/Hz kHz input power 20 dBm. dynamic range was found to span from about ±1.7...
In this study we investigate the effect of deep cryogenic treatment (DCT) on a high-alloyed ferrous alloy (HAFA) to understand resulting chemical and physical changes HAFA's microstructure properties. Using multiple materials analysis techniques, uncover fundamental HAFA with DCT, link in material properties microstructure. The increased carbide nucleation DCT is linked greater solute mobility from modified stress state bonding solutes matrix. turn provides possibility prior formation points...
Abstract Controlled transport of biological cells in biomedical applications such as sorting, cell sequencing, and assembly multicellular structures is a technological challenge. Research areas drug delivery or tissue engineering can benefit from precise location resulting faster response rates more complex structures. Using computational methods, different soft magnetic elements with curved edges are designed to form network, enabling all functionalities for the manipulation microbeads on...
Abstract
Piezoelectric materials have been introduced to transistor gate stacks improve MOSFET behaviour and develop sensor applications. In this work, we present an approach a partly industrial field effect transistor, with stack based upon low temperature AlN. Using the piezoelectric of nitrogen-polar AlN, are able drive by inducing strain across device. To ensure maximum sensitivity, material is placed as closely channel possible operated in most sensitive part sub-threshold regime. This allows...
For the best possible limit of detection any thin film-based magnetic field sensor, functional film properties are an essential parameter. sensors based on magnetostrictive layers, chemical composition, morphology and intrinsic stresses layer have to be controlled during deposition further control influences such as crystallographic effects, pinning effects stress anisotropies. application in surface acoustic wave sensors, layers deposited rotated piezoelectric single crystal substrates. The...
In the development of any type magnetic field sensor based on films, special consideration must be given to layer component. The presented work investigates use flux closing magnetostrictive multilayers for inverse magnetoelectric sensors. such a sensor, highly sensitive AC and DC detection relies strong excitation incorporated layers by piezoelectrically driven cantilever oscillation at mechanical resonances. provoked periodic change is influenced measured picked up coil, which generates...
Abstract Some magnetoelectric sensors require predefined external magnetic fields to satisfy optimal operation depending on their resonance frequency. While coils commonly generate this field, a microelectromechanical systems (MEMS) resonator integrated with permanent magnets could be possible replacement. In proof-of-concept study, the interaction of MEMS and ME sensor is investigated compared standard approach achieve best in terms sensitivity. The achievable sensitivity was evaluated...
This letter uses a surface acoustic wave magnetic field sensor for measurement and closed-loop current control of the inductor in GaN-based dc-dc power converter.The is based on aluminium scandium nitride thin films with relatively high Sc concentration 32% fabricated low-cost 8-in silicon substrate, magnetostrictive FeCoSiB film top SAW delay line.The device has dc bidirectional capability (derived from flux density around trace) operated electrically isolated above trace.With permanent...
Abstract Converse magnetoelectric sensors enable the detection of low‐frequency and low‐amplitude magnetic fields over a bandwidth several kilohertz by combining electrical excitation resonator via piezoelectric layer with an inductive readout. Here, comprehensive sensor model is presented to further foster development this promising concept. The relates output signal device characteristics, taking into account magnetoelastic electromechanical properties, geometry, operating conditions....
The microscopic structure of Fe‐based metallic glasses (FeGaB) and (FeCoSiB) is investigated during in situ thermal annealing using extended X‐ray absorption fine spectroscopy (EXAFS) above the Fe–K Co–K edges. FeGaB exhibits a phase transition 450 °C, changing from amorphous glass to partially crystalline structure. Its medium‐range after this modeled α‐Fe reference structures, combined with nearest‐neighbor (NN) contributions . Local order described same model, restricted NN interactions....