Journal ArticleDOI
Composite ferromagnetic photoresist for the fabrication of microelectromechanical systems
TLDR
By controlling the ratio of nitrogen to oxygen in the source gas as used in the CVD method, the ultimate nitrogen, carbon and fluorine concentrations in the film can be controlled and hence the dielectric constant of the film so produced is controlled.Abstract:
This paper describes a simple method for the microfabrication of mechanically compliant, magnetically-responsive microstructures. These microstructures were fabricated in one step by using a ferromagnetic photoresist, which, in turn, was prepared by suspending nickel nanospheres in a negative photosensitive epoxy (SU8). The nominal diameter of the nickel nanospheres was 80–150 nm, that is, much smaller than the wavelength of the UV light (365 and 405 nm) used to expose the photoresist. Diffraction and scattering of light from the nanospheres allowed for full exposure of the photoresist, even after the incorporation of nanospheres at levels at which it became opaque. The ferromagnetic photoresist was cross-linked after exposure and development, and yielded a stable, compliant, ferromagnetic pattern. The paper characterizes the effect of the weight density of the nickel nanospheres on the transmittance of films made by this technique at wavelengths from 330 nm to 610 nm. It also describes a number of microstructures made with the photoresist: examples include lines, posts and meshes. As a demonstration, the procedure was applied to the microfabrication of a set of magnetically-actuated micromirrors. These micromirrors achieved large deflections: deflection at the tip of a 12 mm long, 250 µ mw ide and 70 µm thick cantilever of the ferromagnetic photoresist exceeded 1.4 mm, when actuated by a NbFeB permanent magnet with field strength ∼120 mT. The cantilever maintained its mechanical properties after cycling ∼10 6 times. S This article has online supplementary materialread more
Citations
More filters
Journal ArticleDOI
Cantilever-like micromechanical sensors
TL;DR: In this article, the basic modes of operation in cantilever-like micromechanical sensors and optical and electrical means for signal transduction are discussed with focus on silicon-and polymer-based technologies.
Journal ArticleDOI
New materials for micro-scale sensors and actuators An engineering review
Stephen A. Wilson,Renaud Jourdain,Qi Zhang,Robert A. Dorey,Christopher R. Bowen,Magnus Willander,Qamar Ul Wahab,Safaa Al-Hilli,Omer Nur,Eckhard Quandt,Christer Johansson,E. Pagounis,Manfred Kohl,Jovan Matovic,Björn Samel,Wouter van der Wijngaart,Edwin Jager,Daniel O Carlsson,Zoran Djinovic,Michael Wegener,Carmen Moldovan,Rodica Iosub,E. Abad,Michael Wendlandt,Cristina Rusu,Katrin Persson +25 more
TL;DR: In this paper, a detailed overview of developments in transducer materials technology relating to their current and future applications in micro-scale devices is provided. And a short discussion of structural polymers that are extending the range of micro-fabrication techniques available to designers and production engineers beyond the limitations of silicon fabrication technology is presented.
Journal ArticleDOI
Programming magnetic anisotropy in polymeric microactuators.
TL;DR: By freely programming the rotational axis of each component, it is demonstrated that the polymeric microactuators can undergo predesigned, complex two- and three-dimensional motion.
Journal ArticleDOI
SU-8 as a structural material for labs-on-chips and microelectromechanical systems.
TL;DR: Different SU‐8‐based techniques have led to new low‐temperature processes suitable for the fabrication of a wide range of objects, from the single component to the complete lab‐on‐chip.
Journal ArticleDOI
Automated biomanipulation of single cells using magnetic microrobots
Edward B. Steager,Mahmut Selman Sakar,Ceridwen Magee,Monroe Kennedy,Anthony Cowley,Vijay Kumar +5 more
TL;DR: This work presents a magnetically actuated robotic system capable of fully automated manipulation of cells and microbeads and demonstrates automated delivery of micro beads infused with chemicals to specified positions on neurons.
References
More filters
Journal ArticleDOI
SU-8: a low-cost negative resist for MEMS
TL;DR: In this paper, the characterization of a home-made negative photoresist developed by IBM is described, called SU-8, which can be produced with commercially available materials and has an outstanding aspect ratio near 15 for lines and 10 for trenches, combined with the electroplating of copper allow the fabrication of highly integrated electromagnetic coils.
Book
Engineering Mechanics of Solids
TL;DR: In this article, the authors present Axial Deformation of Bars: Statically Indeterminate Systems, which is a generalization of Generalized Hooke's Law: Pressure Vessels.
Journal ArticleDOI
2.5-inch disk patterned media prepared by an artificially assisted self-assembling method
TL;DR: In this article, a Ni master disk possessing spiral patterns with 60-250-nm-width lands and a 400-nmwidth groove was pressed into a resist film on a CoPt or CoCrPt film to transfer the spiral patterns.
Journal ArticleDOI
A DNA array sensor utilizing magnetic microbeads and magnetoelectronic detection
Michael M. Miller,Paul E. Sheehan,R. L. Edelstein,Cy R. Tamanaha,L. Zhong,S. Bounnak,Lloyd J. Whitman,Richard J. Colton +7 more
TL;DR: In this article, a multi-analyte biosensor that uses magnetic microbeads as labels to detect DNA hybridization on a micro-fabricated chip is described. And the prototype device is a tabletop unit containing electronics, a chip carrier with a microfluidic flow cell, and a compact electromagnet and is capable of simultaneous detection of eight different analytes.
Journal ArticleDOI
Fabrication of patterned media for high density magnetic storage
Caroline A. Ross,Henry I. Smith,Tim Savas,Mark L. Schattenburg,Maya Farhoud,M. Hwang,Michael E. Walsh,M. C. Abraham,Rajeev J. Ram +8 more
TL;DR: In this paper, a new generation of ultra-high density patterned magnetic storage media has been proposed, and the magnetic properties of the particles and their mutual interactions have been measured.
Related Papers (5)
SU-8: a photoresist for high-aspect-ratio and 3D submicron lithography
A. del Campo,Christian Greiner +1 more