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 C2: Condensed Matter, New Techniques |
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Chair: Mark Riffe, Utah State University Room: 404A |
Friday, October 15, 2010 2:00PM - 2:12PM |
C2.00001: On the use of liquid-metal electrodes for liquid impedance spectroscopy measurements Nathan Kellis, Brian Mazzeo Electrode polarization is an obstacle to the accurate measurement of liquids containing ions. An atomically smooth surface electrode would potentially reduce uncertainties due to electrode polarization. Galinstan was used as a liquid-metal electrode for impedance spectroscopy measurements. Electrodes were formed by adhering Galinstan onto a PMMA plate. Two plates were placed in a parallel plate capacitor arrangement with a liquid reservoir. For comparison, an equivalent arrangement of stainless steel electrodes was constructed. Liquid was pipetted into the reservoirs, and impedance was measured from 40 Hz to 110 MHz. Galinstan electrodes showed increased electrode polarization for ionic liquids and chemical instability. [Preview Abstract] |
Friday, October 15, 2010 2:12PM - 2:24PM |
C2.00002: Measurement of liquid permittivity by solenoid self-resonance Patrick Getz, Brian Mazzeo Permittivity of a liquid is an important macroscopic property which is dependent on the composition and physical state of the liquid. Measurement of liquid permittivity is usually performed using a parallel-plate capacitor or terminated coaxial line. In this study, a solenoid surrounding a column of liquid is used to measure permittivity changes. The inductance of the solenoid is not greatly affected by permittivity and conductivity changes for small diameters. However, the self-capacitance is greatly affected by changing solution conditions. The self-resonance, due to the changing self-capacitance, thus reveals properties of the solution. This is demonstrated on a variety of liquids with varying permittivity and conductivity. [Preview Abstract] |
Friday, October 15, 2010 2:24PM - 2:36PM |
C2.00003: Setup of a micro- Brillouin light scattering apparatus for measuring magnons in patterned magnetic thin films Jason Liu, Andrew Polemi, Kristen Buchanan Brillouin light scattering (BLS) is a sensitive technique for probing the dynamics of a wide variety of magnetic systems. We are currently developing a micro-BLS apparatus where we focus a monochromatic solid state laser at 532 nm onto a magnetic sample using a 100x microscope objective. The incident light scatters inelastically from spin waves or magnons in the magnetic sample. The scattered light is collected by this same microscope objective and the spectral components are analyzed using a Tandem Fabry-Perot Interferometer. The sample sits on a three dimensional translation stage allowing us to map the spin excitations as a function of position with ~355 nm spatial resolution. This micro-BLS apparatus will allow for local spectroscopic measurements on the submicron scale. We plan to use this technique to measure quantized spin wave excitations in nanopatterned structures. Measurements on thin film test samples will be presented. [Preview Abstract] |
Friday, October 15, 2010 2:36PM - 2:48PM |
C2.00004: Scanning Field Emission Microscopy Samuel Tobler, Peter Bennett We describe a ``new'' scanning probe method that is useful for imaging rough or insulating surfaces in vacuum. A conventional STM is operated in feedback mode with high bias voltage (up to 100V) and field-emission current (few nA). The large tip-sample distance (up to 50nm) makes imaging more robust than for tunneling, while retaining good lateral and vertical resolution (a few nm). This is demonstrated with images of atomic steps on Si(111) under a native oxide film. A simple electrostatic model for the imaging is presented. [Preview Abstract] |
Friday, October 15, 2010 2:48PM - 3:00PM |
C2.00005: Planar Millimeter Wave Notch Filters Based on Magnetostatic Wave Resonance in Barium Hexagonal Ferrite Thin Films Lei Lu, Young-Yeal Song, Joshua Bevivino, Mingzhong Wu There is a critical need for planar millimeter (mm) wave devices. To meet this need, one important strategy is in the use of high-anisotropy hexagonal ferrite films. The high internal anisotropy field for the hexagonal ferrites can be used to realize low-loss devices in the 30-100 GHz regime without the need for high external magnetic fields. Previous work has demonstrated the use of M-type barium hexagonal ferrite (BaM) films and ferromagnetic resonance therein to make mm-wave notch filters. This presentation reports on a new mm-wave notch filter that uses magnetostatic wave (MSW) resonance in BaM films. The device consists of a BaM film strip positioned on the top of a coplanar waveguide (CPW), with the strip's length along the CPW signal line. The BaM strip was grown by pulsed laser deposition and had uniaxial anisotropy along the strip's length. The device showed a band-stop filtering response centered at 53 GHz in absence of external fields. One can increase this frequency with nonzero external fields. A reduction in the strip's width resulted in an enhancement in peak absorption. This filtering response resulted from MSW resonance across the BaM strip's width. The MSW modes were excited by CPW-produced non-uniform alternating magnetic fields. [Preview Abstract] |
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