Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session A37: Undergraduate Research II: Condensed Matter PhysicsLive Undergrad Friendly
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Sponsoring Units: APS/SPS Chair: Brad Conrad, George Washington University |
Monday, March 15, 2021 8:00AM - 8:12AM Live |
A37.00001: Magnetic Properties of Alumina-carbon Nanotube Nanocomposites Mediated by Iron Catalysts Steven Rhodes, Suman Neupane Alumina oxide (Al2O3) is an important ceramics insulator and carbon nanotubes (CNTs) have intriguing mechanical, thermal, electrical, and magnetic properties. We report the synthesis of CNTs - Al2O3 nanocomposites using chemical vapor deposition (CVD) process utilizing iron as the catalyst. The structures and morphologies of the as-prepared samples were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffractometer (XRD), thermogravimetric analyzer (TGA), and Mössbauer spectroscopy. The experimental results show that these as-synthesized composites contain CNTs of average diameter of 40 nm distributed homogenously within the alumina matrix. The percentage of CNTs within the composites is around 7%. Magnetic properties of the samples were measured using vibrating sample magnetization at room temperature and under cryogenic conditions. Such characterization is necessary for the synthesis of magnetic nanocomposites with potential for applications in various materials. |
Monday, March 15, 2021 8:12AM - 8:24AM Live |
A37.00002: Growth of PZT on Nanosphere templates by Glancing Angle Vapor Deposition and Growth Modeling Derick DeTellem, Pritish Mukherjee, Sarath Witanachchi Growth of coatings on a curved surface at steep angles enables the formation of pillar structures. In this research glancing angle laser deposition method was used to deposit Lead Zirconium Titanate (PZT) nanostructures on silica nanoparticle templates in the size range of 3.5mm to 250 nm. Self-assembled silica nanosphere templates were prepared by the Langmuir-Blodgett technique. It was observed that the diameter of the pillars and the number of pillars on each nano sphere decreased with decreasing sphere size. A simple model based on the nucleation theory that is adopted for nucleation and growth on a curved surface was developed to predict the evolution of the nanopillar structures. Results pertaining to the morphology, structure, and composition investigated for varying template sphere sizes by SEM, EDS, AFM, and XRD will also be presented. |
Monday, March 15, 2021 8:24AM - 8:36AM Live |
A37.00003: Measurement of the Low Temperature Thermal Conductivity of 3D Printed Material Alejandro Reyes Borunda, Michael Ray In continuation of our measurement of the low temperature properties of polylactic acid (PLA), which is a material commonly used in for 3D printing, we designed an experiment to measure its thermal conductivity between 77K and 300K. We will present results from the experiment and discuss its implications, and discuss its implications on the possibility of being able to use this material in low temperature environments. |
Monday, March 15, 2021 8:36AM - 8:48AM Live |
A37.00004: Thermal Characterization of Pr1-xNdxOs4Sb12 in Normal State Matthew Brown, Pei-Chun Ho, M Brian Maple, Tatsuya Yanagisawa Pr1-xNdxOs4Sb12 is a series of compounds which, at low temperatures, exhibits strongly correlated electron behaviors such as unconventional superconductivity and ferromagnetism. The specific heat of distinct concentrations of Nd were measured as a function of temperature from 11K–300K. Using the Debye, Einstein, and Sommerfeld models to curve fit the specific heat data, we can extract the Debye Temperature, the Einstein Temperature, and the Sommerfeld coefficient. These properties characterize the compound series: the Debye Temperature describes the stiffness of the crystal structure, the Einstein Temperature reveals the rattling effect of the rare earth ions, and the Sommerfeld coefficient explains the correlation between the electrons. Analysis of preliminary data[1] indicates the possibility of minimums in the extracted parameters near x=0.5. However, this analysis has a sizeable error, especially in regions where the sample heat capacity drops below 20% of the background. Hence, we plan to remeasure some x in order to decrease the observed error. |
Monday, March 15, 2021 8:48AM - 9:00AM Live |
A37.00005: Ionic liquid gated poly(triaryl amine) thin film field effect transistor Kelotchi Sebastian Figueroa Nieves, Luis M Rijos, Angelo Porcu, Naomi Rivera, Anamaris Melendez, Idalia Ramos, Nicholas Pinto In this work a poly(triaryl amine) (PTAA) thin film field effect transistor was investigated with ionic liquid (IL) gating. This is the first report on ionic liquid gating in PTAA. The transistor retained a high on/off ratio of ~700 and mobility of ~10-2 cm2/V-s. When compared to a transistor based on the conducting polymer polyaniline under similar operating conditions, it was found to exhibit superior performance. Significantly low operating voltages (±1V) enhance the possibility of their use in organic electronics. The device was successfully tested for binary operation, and we demonstrate its suitability for use in low power consumption electronic circuits. |
Monday, March 15, 2021 9:00AM - 9:12AM Live |
A37.00006: Giant Reversible Magnetostriction in a Ferromagnet–Polymer Composite. Thomas Richardson, Austin Schleusner, E. Dan Dahlberg A magnetostrictive ferromagnet–polymer composite consisting of steel wires suspended in a polymer matrix has been developed that exhibits large reversible magnetostrictive strain in relatively low magnetic fields. The strain for a fixed field is a nonmonotonic function of wire loading for the longer wires investigated, and the strain for a given wire loading increases with decreasing the wire length. Within the limits of this study, a maximum saturation strain of 60.2% in a 7.5 kOe field was observed with a wire length of 0.50 cm and a wire volume fraction of approximately 0.2. No degradation in strain was observed over the maximum number of 50 expansion cycles. |
Monday, March 15, 2021 9:12AM - 9:24AM Live |
A37.00007: Synthesis and physical properties study of polar oxides HoMWO6 (M=Cr,Fe). Duy Pham, Christian Bucholz, Connor Quick, Taofiq Lawal, Ram C Rai, Chetan Dhital Polar oxides are an important system to study due to their technologically relevant properties such as ferroelectricity, multiferroicity, piezoelectricity, magnetoelectricity. Recently, RFeWO6 (R=Dy, Y, Tb, Eu) type polar oxides were synthesized and type-II multiferroic property was reported [1]. We have extended this series and successfully synthesized HoCrWO6 and HoFeWO6 in polar structures [2]. We have also studied the crystal and magnetic structure of these compounds. We will present the synthesis method and compare/contrast the magnetic properties and magnetic structures of these isostructural compounds to investigate the role of transition metal ions. |
Monday, March 15, 2021 9:24AM - 9:36AM Live |
A37.00008: In-situ solution growth of single crystalline Li2Mn2(MoO4)3 Francisco Burgos, Cristian David Franco, Bingying Xia, Alicia M. Baccarella, Jose Nicasio, Eric Dooryhee, Allison Wustrow, James Richmond Neilson, Jack Simonson New materials have been sought for battery cathodes for lithium-ion batteries and supercapacitors due to their shorter charging times, faster electron resorption, and high potential capacities. The development of single crystals is essential to analyze intrinsic properties of a material since they eliminate contributions from extrinsic factors such as impurities and grain boundaries. Here we present a method to grow high quality Li2Mn2(MoO4)3 single crystals from molten oxide solution. In-situ x-ray diffraction measurements allowed us to optimize the crystal growth of this material and avoid the formation of an undesired intermediary compound. These results show a way to accelerate the discovery and synthesis of new battery cathode materials. |
Monday, March 15, 2021 9:36AM - 9:48AM Live |
A37.00009: Characterization of CPW resonators on InAs-Al heterostructures Joshua Tong, William Strickland, Joseph Yuan, Matthieu Dartiailh, Javad Shabani Superconducting microwave coplanar waveguide (CPW) resonators are essential for many quantum devices. From applications in quantum information to sensing CPW resonators are used as an integral part of superconducting circuits. In the pursuit of InAs-Al based microwave devices we characterize resonators with relevant substrates: InP, InAlAs, and the full hybrid structure. We have studied the internal and external Q factors from the complex transmission signal. Furthermore, we also investigate the influence of environmental terms to find the limitations for microwave circuits on this III-V platform. |
Monday, March 15, 2021 9:48AM - 10:00AM Live |
A37.00010: Low Cost Electronics Design for Cooled Scanning Probe Microscope
Andrew Smeltzer, Dr. Sagar Bhandari
Department of Physics and Engineering, Slippery Rock University Andrew Smeltzer, Sagar Bhandari The ability to measure and manipulate electrons at the nanoscale gives insight into nanoscale physics and paves way for its applications in electronics and photonics. We present a design of the electronics for a scanning probe microscope that is cooled to 77K. Our design was created so that it is possible for smaller undergraduate facilities to replicate the design. The imaging technique relies on a conductive scanning tip that acts as a local, movable electrostatic gate. The tip creates a local change in density of electrons in the material directly underneath it, deflecting the electrons away from their original path. The conductance is measured as a function of tip position while the tip moves across the sample. The conductance change vs. tip position gives the map of the electron flow. A raspberry pi controls the microscope. The conductance value is converted to a voltage that is amplified and sent to the pi to be stored and used for feedback. The pi uses this feedback keep the tip at a constant height above the sample. The pi controls a piezoelectric tube to control the tip position during the scan. Scanning and collecting data is done using our own software. With this method, we plan to image the viscous flow of electrons in graphene at liquid nitrogen temperature. |
Monday, March 15, 2021 10:00AM - 10:12AM On Demand |
A37.00011: Magnetic-field excited domain wall motion in antiferromagnetically-coupled bubble skyrmion pairs Mallory Yu, Xiao Wang, Andy T Clark, Rajesh Chopdekar, Pavel Lapa, John Pearson, Suzanne G.E. te Velthuis, Axel Hoffmann, Xuemei Cheng Antiferromagnetically (AFM) coupled skyrmion pairs, compared to ferromagnetic skyrmions, have richer physics and offer technological advantages for spintronic device applications due to their compensation of skyrmion Hall effects and expected higher mobility. Here we report a direct imaging study on the magnetic-field excited motion of the chiral domain walls (DWs) located at the boundary of the AFM-coupled bubble skyrmion pairs using element-specific x-ray photoemission electron microscopy. These AFM-coupled skyrmions were created across the interfaces of the AFM-coupled Co and Gd layers in a sputtered Ta/Pt/[Co/Gd/Pt] 10 /Al multilayer film. With in-situ pulsed magnetic fields of different magnitudes applied slightly off the film plane (<5 degrees), we observed the motion of DWs, causing a decrease or increase in the size of bubble skyrmions. When excited by the fields H>50 Oe, DWs move slightly towards the center of the bubble skyrmions causing skyrmions to shrink. When 50 Oe<H<140 Oe, DWs move outward without showing any preferred direction. However, at fields H>140 Oe, the asymmetric motion of DWs favoring the in-plane field direction was observed, which may be attributed to the different spin reorientations direction within the chiral DWs with respect to the applied field. |
Monday, March 15, 2021 10:12AM - 10:24AM Live |
A37.00012: Measurement of the Low Temperature Porosity of 3D Printed Materials Ryann Hee, Michael Ray 3-D printed materials have opened the door to the efficient and affordable manufacturing of unique geometries. These materials have the ability to transform fabrication of low temperature apparatuses, however not much is known about how these materials behave at low temperatures. In order to determine what applications this material can be used for at low temperatures, we designed an experiment to measure the porosity of PLA by measuring the flow of helium gas through it between 300 and 77K. Preliminary results have shown an increase in the flow rate at low temperatures. We plan to investigate this further with an improved experimental set-up. |
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