Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session M05: Materials II |
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Chair: Eric Montoya, University of Utah Room: UNM PAIS 1140 |
Saturday, October 15, 2022 1:00PM - 1:24PM |
M05.00001: Engineering the chiroptical response of nano-helical metamaterials by careful selection of constituent material underpinnings Invited Speaker: John G Gibbs In this talk, I will briefly describe our lab's efforts to engineer the chiroptical response of nano-helix-based metamaterials to target specific frequency ranges. The fabrication method employed allows for a high level of versatility with respect to materials that can be chosen, e.g. metals, semiconductors, insulators, etc. As an example, we have achieved tuning the chiroptical response—using a seminconductor—within the near ultraviolet portion of the spectrum, which cannot easily be achieved with plasmonics-based chiral metamaterials. I will also discuss an unexpected result that we observe when combining different types of materials into the individual nanostructures. |
Saturday, October 15, 2022 1:24PM - 1:36PM |
M05.00002: Topologically-protected defects in 2D/3D crystals involving higher-dimensional order parameters Tayler Martin, Branton J Campbell Magnetic skyrmions are topological structures in crystalline materials in which a continuous magnetic vector field can't be unraveled without introducing discontinuities and which has as conserved topological charge. We are exploring generalizations of the skyrmion concept for higher dimensional order parameters such as those that arise in arbitrary antiferromagnetic or displacive phase transitions. |
Saturday, October 15, 2022 1:36PM - 1:48PM |
M05.00003: Characterization of novel 3d printed models in delayed aneurysm rupture after flow diversion treatment. Jorge A Muñoz
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Saturday, October 15, 2022 1:48PM - 2:00PM |
M05.00004: Optimization of GaAs to Si Cross-Bonding with Minimal Thermal Activation and Compression in Ambient Air through NanoBondingTM Pranav Penmatcha, Nimith Gurijala, Siddarth Jandhyala, Aashi Gurijala, Arjun Sekar, Nicole Herbots Recently, GaAs/Si tandem solar cells have proved to be the most efficient in NREL reviews, but their efficiency is lowered by residual oxides and high processing temperatures used (>400°C), which cause defects at the interface. Nano-Bonding (NB) combined Surface Energy Engineering can reduce T≤200°C. SEE optimizes synergistically GaAs and Si by rendering one surface highly hydrophilic, acting as an electron donor, while the second surface is made more hydrophobic. By analyzing 15 GaAs/Si wafer pairs, Si(100) is found to be more easily engineered while GaAs(100) is simply rendered highly reactive and highly hydrophilic via dilute oxide etching. Surface energies measured via Three Liquid Contact Angle Analysis correlate with O coverage on GaAs measured via High Resolution Ion Beam Analysis, and with oxidation states measured via X-Ray Photoelectron Spectroscopy (XPS). SEE reproducibly increases GaAs surface energies by a factor of 2, with a 50% decrease in O coverage from 7 ML to 3.5 ML. XPS shows that O-rich As2O5 decreases while As2O3 increases. Surface Acoustic wave Microscopy show that 98 % of GaAs can nano-bond successfully to Si at low temperatures with light compression, although nano-bonding can occur beyond the area compressed. |
Saturday, October 15, 2022 2:00PM - 2:12PM |
M05.00005: The effect of x-ray illumination on magnetic domain memory in [Co/Pd] / IrMn multilayers Colby S Walker, Mason L Parkes, Tim Anderson, David Keavney, Eric E Fullerton, Karine Chesnel We are studying the effect that illumination by coherent resonant x-rays may have on magnetic domain memory (MDM) in a [Co / Pd] / IrMn multilayers [1-3]. MDM is the ability of the magnetic domains to retain their exact same domain topology upon field cycling. Earlier studies have suggested that under higher dose of x-ray illumination, the material may lose its existing MDM. To investigate this potential effect, we have used both x-ray resonant magnetic scattering (XRMS) along with magneto-transport measurements [4,5] to track the exchange bias while the sample is illuminated with x-rays. Magneto-transport is here used to measure the hysteresis loop of our multilayers material from which we can measure the exchange bias. A loss of exchange bias would indicate that the x-rays illumination dose may alter the strength of the exchange couplings and ultimately the amount of MDM. Knowing if a loss of exchange bias has occurred requires collecting magneto-transport data as well as XRMS data and correlating the observed changes under various dose of x-ray illumination. The data has been collected at different angles as well as at different configurations. These configurations consist of Hall effect measurements as well as magnetoresistance measurements. The resulting signal measured on the inner contacts has been modeled as a combination of both the Hall effect and magnetoresistance signal. |
Saturday, October 15, 2022 2:12PM - 2:24PM |
M05.00006: An Analysis of the Magnetic Properties of CrMnFeCoNi Emma M Zappala, Benjamin A Frandsen High-entropy alloys are comprised of 5 or more elements in equal proportions, resulting in a large configurational entropy. These alloys' unique composition gives rise to properties not observable in conventional materials. While many of these alloys are known to be magnetic, their magnetic properties have not been studied in detail. CrMnFeCoNi, or Cantor's alloy, is one of the most well known high-entropy alloys. We used muon spin relaxation, a highly sensitive probe of magnetism, to examine the magnetism of various samples of Cantor's alloy, including samples undergoing different treatments in formation and samples with nonequiatomic stoichiometry. The magnetic transition temperature and character of the transition are found to be highly sensitive to the preparation methods and atomic ratios. We also observe significant differences in the spin dynamics depending on the composition. These results set the stage for investigating applications of the magnetic properties of high entropy materials. |
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