Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session B05: Functionalities of Materials II |
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Chair: Ian Leahy, University of Colorado Boulder |
Friday, October 8, 2021 10:30AM - 10:42AM |
B05.00001: Magnetic Domain Properties of Co/Pt Multilayer Thin Films Michael Vaka, John Ray, Olav Hellwig, Karine Chesnel The magnetic domain patterns that form on Co/Pt multilayer thin films display perpendicular anisotropy and produce a mix of stripe and bubble domains. The morphology of such domains is of interest for high-density magnetic data storage. We studied how the domain morphology changes throughout the magnetization process, for different thicknesses of Co and different numbers of layer repeats. We use magnetic force microscopy (MFM) to investigate the domain morphology while applying a magnetic field in situ. We completed these studies for layer repeats of N$=$20, 18 and Co/Pt thicknesses of 10 {\AA} / 7 {\AA}. We find that an applied field has a significant effect on the morphology of the domains and consequently on their density. These studies are useful for data storage applications and characterizes effects of applied fields on these films. [Preview Abstract] |
Friday, October 8, 2021 10:42AM - 10:54AM |
B05.00002: The effect of x-ray illumination on magnetic domain memory in {[Co/Pd] / IrMn multilayers} Colby Walker, Mason1 Parkes, Caleb Olsson, David Keavney, Eric 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. [Preview Abstract] |
Friday, October 8, 2021 10:54AM - 11:06AM |
B05.00003: Deconvolution and the Magnetic Pair Distribution Function Kane Fanning, Benjamin Frandsen The magnetic pair distribution function is useful in determining short-range magnetic order and structure in many interesting materials, but is susceptible to the introduction of large, non-physical artifacts in the data processing routines used to produce it. Numerical deconvolution holds promise as an alternative method capable of producing a sample's magnetic pair distribution function without introducing as much error. We hope to use numerical deconvolution in the normalization step of our data processing routine in order to create an algorithm capable of producing more accurate magnetic pair distribution functions from experimentally obtained neutron scattering data. Functional utilization has not yet been achieved, but current results hold promise for future success. [Preview Abstract] |
Friday, October 8, 2021 11:06AM - 11:18AM |
B05.00004: Probing thermal decomposition of Ni$_{\mathrm{3}}^{\mathrm{+2}}$[Fe$^{\mathrm{3+}}$(CN)$_{\mathrm{6}}$]$_{\mathrm{2}}$.nH$_{\mathrm{2}}$O Md Minuddin, Eric Novac, Luke Daemen, Boris Kiefer, Heinz Nakotte The Prussian Blue Analogue (PBA), Ni$_{\mathrm{3}}^{\mathrm{+2}}$[Fe$^{\mathrm{3+}}$(CN)$_{\mathrm{6}}$]$_{\mathrm{2}}$.nH$_{\mathrm{2}}$O, has a framework structure with alternating C$_{\mathrm{6}}$ and N$_{\mathrm{6}}$ octahedra with the transitional metals at the octahedral centers and connected with rigid $C-N $bonds. The water molecules are located either in the framework between octahedra or on C or N defect sites. Thermal decomposition PBA is commonly inferred from the Thermogravimetric Analysis (TGA) by considering the mass loss is due to the loss of water molecules, while the framework structure remains the same. We had performed DFT calculations, and it indicates a different decomposition mechanism. To probe the decomposition, we prepared a deuterized sample as D has higher coherent scattering length than H. We performed powder neutron diffraction at different temperatures between room temperature and 600$^{\mathrm{0}}$C. We used Rietveld refinement on the average structure and pair distribution function analysis on the local structure. Our analysis shows that at elevated temperature the framework structure is distorted, and certain bond vanishes. [Preview Abstract] |
Friday, October 8, 2021 11:18AM - 11:30AM |
B05.00005: Surface Energy Engineering (SEE) Correlated to Crystal Anisotropy of Piezo-Electric LiTaO3 for Nano-Bonding to Si and alpha-quartz SiO2 (T \textless 453 K) Shreyash Prakash, Hemanth Yalahanka, Shefali Prakash, Mohammed Sahal, Abbie Elison, Brian Baker, Saaketh Narayan, Lauren Puglisi, Robert J. Culbertson, Nicole Herbots One of the most piezoelectric materials, LiTaO3, is ideal for voice activated Si chips. Currently, heteroepitaxy (HE) and Direct Wafer Bonding (DWB) can't integrate highly anisotropic (c/a$=$2.7) trigonal LiTaO3 to cubic diamond Si (c-Si)-- nor to trigonal alpha -quartz SiO2 (a-qSiO2, c/a$=$1.1). The lattice mismatch is 255{\%}, thus HE is impossible. Moreover, the thermal expansion mismatch is huge. LiTaO3 expands 8X more than Si and 25X more than a-qSiO2. LiTaO3 decomposes into Ta2O5 and Li ions at T\textgreater 673K so DWB and HE destroy LiTaO3. But this work uses Nano-Bonding (NB) at T\textless 453K by Surface Energy $\gamma $ Engineering (SEE) to modify surfaces into complementary, unstable states via 2D precursor phases catalyzing NB. Hydro-affinity (HA) and $\gamma $ scales with surface interactions. Three Liquid Contact Angle Analysis (3LCAA) can measure HA and $\gamma $ and map them along crystal directions. Contact angles on LiTaO3 are found to vary significantly by 40{\%} with crystal direction. Anisotropy of HA correlates with $\gamma $. $\gamma $ varies only 6{\%} with crystal directions and yields insights into SEE. [Preview Abstract] |
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