Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 55, Number 9
Friday–Saturday, October 15–16, 2010; Ogden, Utah
Session K5: Applied Physics II |
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Chair: Bradley Carroll, Weber State University Room: 312 |
Saturday, October 16, 2010 11:30AM - 11:42AM |
K5.00001: Carbon Nanotube Templated Microfabrication of Porous Silicon-Carbon Materials Jun Song, David Jensen, Andrew Dadson, Michael Vail, Matthew Linford, Richard Vanfleet, Robert Davis Carbon nanotube templated microfabrication (CNT-M) of porous materials is demonstrated. Partial chemical infiltration of three dimensional carbon nanotube structures with silicon resulted in a mechanically robust material, precisely structured from the 10 nm scale to the 100 micron scale. Nanoscale dimensions are determined by the diameter and spacing of the resulting silicon/carbon nanotubes while the microscale dimensions are controlled by lithographic patterning of the CNT growth catalyst. We demonstrate the utility of this hierarchical structuring approach by using CNT-M to fabricate thin layer chromatography (TLC) separations media with precise microscale channels for fluid flow control and nanoscale porosity for high analyte capacity. [Preview Abstract] |
Saturday, October 16, 2010 11:42AM - 11:54AM |
K5.00002: Patterned Carbon Nanotube X-Ray Windows Jonathan Abbott, Richard Vanfleet, Robert Davis By lithographically patterning catalyst particles carbon nanotube forests can be grown with nearly arbitrary geometries. The patterned nanotube forest can then be infiltrated via chemical vapor deposition with a variety of materials to form self-supporting structures with the same shape as the nanotube forest. As an application of this process, x-ray window support frames were made using carbon as the infiltrating material. Window supports made with this process could give a lower background signal, higher collection angles, and lower cost processing than current window frames. Characterization of the infiltration and strength of the structure is presented. [Preview Abstract] |
Saturday, October 16, 2010 11:54AM - 12:06PM |
K5.00003: Hexagonal barium ferrite thin film-based millimeter wave phase shifters Zihui Wang, Young-Yeal Song, Yiyan Sun, Joshua Bevivino, Mingzhong Wu, V. Veerakumar, Timothy Fal, Robert Camley There is a critical need for the extension of current microwave magnetic device physics and technology into the millimeter (mm) wave regime. In order to meet this need, one important strategy is in the use of high-anisotropy barium hexagonal ferrites. The high anisotropy for the hexagonal ferrites can be used to realize operational devices in the 30-100 GHz regime without the need for high external bias fields. This presentation reports on the first demonstration of a hexagonal ferrite thin film-based planar millimeter-wave phase shifter. The device made use of an M-type barium hexagonal ferrite (BaM) thin film and a coplanar waveguide geometry. The film was prepared by pulsed laser deposition. The phase tuning relied on ferromagnetic resonance in the BaM film. The device showed a phase tuning rate of 43\r{ }/(mm$\cdot $kOe) and an insertion loss of 3.1 dB/mm in the on-resonance regime. In off-resonance regimes, the device showed smaller loss and smaller tuning rates. The experimental results were confirmed by theoretical calculations. [Preview Abstract] |
Saturday, October 16, 2010 12:06PM - 12:18PM |
K5.00004: Ballistics of space launch by a rail gun Alexander Panin The idea of using a big gun to launch objects to space has been around for years -- even Isaac Newton considered the concept. However the technology of accelerating a payload with a gun only recently began approaching orbital velocity (8 km/sec). NASA is currently experimenting with a rail gun which utilizes a magnetic field powered by electricity to accelerate a projectile along a set of rails, similar to train rails. Velocities up to 3 km/sec have been reported for small projectiles, and it seems that orbital velocities can soon become a reality too. We model a launch of various projectiles from Earth surface into the elevation corresponding to the low Earth orbit (about 200-250 km above Earth's surface). The goal of this modeling is to study feasibility of such launch (and accelerations induced), and the ballistics of the flight via Earth's atmosphere (the trajectory, air drag induced, pressure and temperature generated by air drag, etc) and thus the requirements for a mass, size, strength, heat shield, and general design of a payload capsule. [Preview Abstract] |
Saturday, October 16, 2010 12:18PM - 12:30PM |
K5.00005: Ferromagnetism inside of magnetic tunneling junctions Glennie Mesa Over this past summer I performed research with different annealing temperatures cooling rates for Magnetic Tunneling Junctions (MTJ's). The MTJ's were composed of a 3nm FeCoB ferromagnet, a 1.6 nm MgO tunneling barrier, and a 3nm FeCoB ferromagnet pinned by a 15nm IrMn anti-ferromagnet. This speech also includes a review of concepts that include; coercivity (of the free and fixed layer), Tunneling Magneto resistance (TMR), exchange bias, and a basic concept of the parallel/anti-parallel configuration of the sample and how this affects resistance. This particular study was on two things; \begin{enumerate} \item How the maximum thermal annealing temperature affects TMR. \item How holding the maximum thermal annealing temperature constant and varying the cooling rates (.2 c/sec, 2 c/sec, 137 c/sec) affects the coercivity of the free layer and the exchange bias. \end{enumerate} [Preview Abstract] |
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