A5043830254- Force Microscopy Techniques and Applications
- Magnetic properties of thin films
- Micro and Nano Robotics
- Advanced MEMS and NEMS Technologies
- Microfluidic and Bio-sensing Technologies
- Modular Robots and Swarm Intelligence
- Adhesion, Friction, and Surface Interactions
- Near-Field Optical Microscopy
- Characterization and Applications of Magnetic Nanoparticles
- Mechanical and Optical Resonators
- Magnetic Properties and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Measurement and Metrology Techniques
- Geomagnetism and Paleomagnetism Studies
- Magnetic and Electromagnetic Effects
- Advanced Data Storage Technologies
- Advanced Materials and Mechanics
- Theoretical and Computational Physics
- Advanced Surface Polishing Techniques
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Surface Roughness and Optical Measurements
- Nanofabrication and Lithography Techniques
- Acoustic Wave Resonator Technologies
- Semiconductor materials and devices
University of Twente
2015-2024
Delft University of Technology
2023-2024
KIST Europe
2014-2023
Korea Institute of Science and Technology
2014-2023
Saarland University
2016-2021
Utrecht University
2019
Korean Association Of Science and Technology Studies
2018
IBM Research - Zurich
2015
Institute of Nanotechnology
2015
Integrated Micro Sensors (United States)
2008-2011
In this work, a propulsion system similar in motion to sperm-cell is investigated. This consists of structure resembling with magnetic head and flexible tail 42 μm 280 length, respectively. The thickness, width are 5.2 μm, 322 includes 200 nm-thick cobalt-nickel layer. layer provides dipole moment allows the align along oscillating weak (less than 5 mT) field lines, hence generates thrust force that overcomes drag force. frequency response shows mechanism for swimming at an average speed 158...
We present a transfer-function approach to calculate the force on magnetic microscope tip and stray field due perpendicularly magnetized medium having an arbitrary magnetization pattern. Under certain conditions, it is possible pattern from measured data. apply this transfer function theory quantitatively simulate microscopy data acquired CoNi/Pt multilayer epitaxially grown Cu/Ni/Cu/Si(001) thin film. The method described here serves as excellent basis for (i) definition of condition...
A method of heat-assisted magnetic recording potentially suitable for probe-based storage systems is characterized. In this work, field-emission current from a scanning tunneling microscope tip used as the heating source. Pulse voltages 2–7 V were applied to CoNi∕Pt multilayered film. During heating, various external fields applied. Experimental results show that positive field increases mark size while negative decreases size, compared case writing without an in which average 170 nm was...
Realization of point-to-point positioning a magnetotactic bacterium (MTB) necessitates the application relatively large magnetic field gradients to decrease its velocity in vicinity reference position. We investigate an alternative closed-loop control approach position MTB. This is based on characterization dipole moment MTB and response with alternating direction. do not only find agreement between our characterized previously published results, but also observe that decreases by 37% when...
This article describes an approach for implementing a complete computer system (CPU, RAM, I/O, and nonvolatile mass memory) on single integrated-circuit substrate (a chip)—hence, the name “single-chip computer.” The presented combines advances in field of microelectromechanical systems (MEMS) micromagnetics with traditional low-cost very-large-scale integrated circuit style parallel lithographic manufacturing. primary barrier to creation chip is incorporation high-capacity [many gigabytes...
Atomic force microscope tips coated by the thermal evaporation of a magnetic 30 nm thick Co film have been modified focused ion beam milling with Ga+ ions to produce suitable for microscopy. Such possess planar element high shape anisotropy, an extremely aspect ratio greater than 30:1, and end radius less 25 nm. These used in commercial atomic under ambient conditions obtain resolution images established CoNi/Pt multilayer reference sample.
Magnetic systems have the potential to control motion of microparticles and microrobots during targeted drug delivery. During their manipulation, a nominal magnetic force-current map is usually derived used as basis system design. However, inevitable mismatch between actual maps along with external disturbances affects positioning accuracy system. In this paper, we devise that allows for realization point-to-point paramagnetic microparticles. This accomplished by estimating rejecting 2-D...
This paper reports on the piezoelectric-microelectromechanical system micro-fabrication process and behavior of piezoelectric stacks actuated silicon cantilevers.All oxide layers in stacks, such as buffer-layer/bottom-electrode/film/top-electrode: YSZ/SrRuO 3 /Pb(Zr,Ti) /SrRuO , were grown epitaxially Si template silicon-on-insulator substrates by pulsed laser deposition.By using an analytical model finite element simulation, initial bending cantilevers was calculated.These theoretical...
Interaction between dipolar forces, such as permanent magnets, generally leads to the formation of one-dimensional chains and rings. We investigated whether it was possible let dipoles self-assemble into three-dimensional structures by encapsulating them in a shell with specific shape. found that condition for self-assembly crystal is satisfied when energies parallel antiparallel states are equal. Our experiments show most regular formed using cylinders cuboids not spheroids. This simple...
Individual biohybrid microrobots have the potential to perform biomedicalin vivotasks such as remote-controlled drug and cell delivery minimally invasive surgery. This work demonstrates formation of sperm-templated clusters under influence an external magnetic field essential functionalities for wireless actuation delivery. Ferromagnetic nanoparticles are electrostatically assembled around dead sperm cells, resulting nanoparticle-coated cells magnetically into three-dimensional clusters. The...
Magnetic continuum manipulators (MCMs) are a class of robots that can be actuated without direct contact by an external magnetic field. MCMs operating in confined workspaces, such as those targeting medical applications, require flexible structures contain combinations components and polymers to navigate long tortuous paths. In cylindrical MCM designs, significant trade-off exists between moment bending flexibility the ratio length diameter decreases. this study, we propose new design...
This work investigates modeling and control of microparticles that could be guided inside the human body using external magnetic fields. Proposed areas applications for these include but not limited to minimally invasive surgeries, diagnosis sensing. The problem is formulated by a prototype system which has been developed purpose wireless motion microparticles. A devised based on way-point approach navigation in fluid. In addition, path planning procedure combination potential field A*...
Due to the low frequency of circulating tumor cells (CTC), standard CellSearch method enumeration and isolation using a single tube blood is insufficient measure treatment effects consistently, or steer personalized therapy. Using diagnostic leukapheresis this sample size can be increased; however, also calls for suitable new process larger inputs. In order achieve this, we have optimized immunomagnetic enrichment flow-through magnetophoretic system. An overview major forces involved in...
With laser interference lithography Co/sub 50/Ni/sub 50//Pt multilayers with perpendicular magnetic anisotropy have been patterned into regular matrices of submicron sized dots. Their properties studied Vibrating Sample Magnetometry. Compared to continuous (H/sub c/=15 kA/m) the coercivity for is much larger c/=115-270 kA/m). Though hysteresis curves 180 nm dots and 60 identical shapes, virgin seem indicate that are multidomain while single domain. The latter has confirmed Magnetic Force...
Magnetic dot arrays with perpendicular magnetic anisotropy were fabricated by patterning Co(80)Pt(20)-alloy continuous films means of laser interference lithography. As commonly seen in large arrays, there is a difference the switching field between dots. Here we investigate origin this distribution, using anomalous Hall effect (AHE). The high sensitivity AHE permits us to measure reversal individual dots an array 80 diameter 180 nm. By taking 1000 hysteresis loops reveal thermally induced...