Skip to main content

Highlights

Research achievements from the NSF MIP community.

Research Highlights

Figure 1: Cover of the November/December 2022 issue of the Journal of Vacuum Science and Technology A that features the newly discovered phases and the electron micrographs of the epitaxially grown samples realized at PARADIM.
Nov 14, 2022
Cornell University

From Machine Learning to Discovery of New Family Member

Lena F. Kourkoutis and Darrell G. Schlom (Cornell University)
Thin films of Ba3In2O6 had never been made and PARADIM researchers were able to grow the desired phase using a new variant of molecular-beam epitaxy (MBE), suboxide MBE, developed in PARADIM. In addition to succeeding in the growth of the targeted phase, Ba3In2O6, PARADIM researchers also discovered a new barium indate phase with an even simpler crystal structure, Ba4In2O7, that is analogous to the first high-temperature cuprate superconductor discovered, (La,Ba)2CuO4.
Figure 1: a, The 4D-LSTEM setup. The deflection angle (black-dashed lines) caused by the lateral magnetic induction field (B) in the sample via the Lorentz force is measured by a 2D pixel array detector, such as an EMPAD. b, Measured magnetic phase shift of a skyrmion lattice in FeGe reconstructed from LEP using a 4D-LSTEM dataset. Out-of-plane component of B goes inwards (labelled as a circle with a cross). c, Lateral magnetic field map calculated via the first-order gradient of the phase recorded in b. The color shows the direction, and the brightness shows the magnitude, as given by the color wheel in the lower left inset in c. d, Magnetic-field vector map from the enlarged region marked by a white box in c. The arrows represent the magnetic field vectors with the length representing the lateral magnetic field magnitude. The false color shows only the magnetization direction. The dataset was acquired at a temperature of 94 K with an external magnetic field of 130 mT pointing into the page. Scale bars, 50 nm.
Oct 31, 2022
Cornell University

Lorentz Ptychography for high-resolution, high sensitivity magnetic imaging

David A. Muller (Cornell University)
The study establishes a quantitative, high-resolution magnetic microscopy technique that can reveal nanoscale spin textures, especially magnetization discontinuities and topological defects in nanomagnets. The technique’s high-dose efficiency should also make it well suited for the exploration of magnetic textures in electron radiation-sensitive materials such as organic or molecular magnets.
(a) Chemical structure and the MALDI spectrum of DMG-PEG2000 and (b) the chemical structure and MALDI spectrum of discrete PEG oligomers
Oct 14, 2022
University of California, Santa Barbara

Discrete Libraries of Amphiphilic Poly(ethylene glycol) Graft Copolymers: Synthesis, Assembly, and Bioactivity

Junfeng Chen, Aoon Rizvi, Joseph P. Patterson, and Craig J. Hawker (UCSB and UCI)
Demonstration of a novel strategy for the scalable synthesis of multiple libraries of discrete lipid poly(ethylene glycol) (DMG-PEG) derivatives, with precise control over the structure and molecular weight.
Comparison of SAXS data between BioPACIFIC MIP and SLAC
Oct 3, 2022
University of California, Santa Barbara

Efficient Creation and Morphological Analysis of ABC Triblock Terpolymer Libraries

Craig Hawker and Christopher Bates (UCSB)
A versatile and scalable strategy to separate parent triblock terpolymers into libraries of fractionated samples spanning a wide range of compositions was developed.
Dr. Stieg and Dr. Panchanathan at the Living Biofoundry
Sep 13, 2022
University of California, Santa Barbara

National Science Foundation Director Visits BioPACIFIC MIP Facilities

Dr. Sethuraman Panchanathan, Director of the National Science Foundation, recently visited UCLA to meet with students, faculty members, and campus leaders.
Figure 1: Rutile GeO2—a promising material—Identified by theory—Realized in thin film and bulk form. (left) Lattice parameters of rutile compounds.  Only three rutile substrates are commercially available (pink). The grid line indicates misfit strain with respect to GeO2 substrates. (right top) Photograph of r-GeO2 single crystals synthesized by the flux method. Crystal sizes reach up to 4 mm. (right bottom) Atomic force microscopy image of a r-GeO2 single-crystal substrate after surface planarization by mechanical polishing and annealing.
Aug 31, 2022
Cornell University

Realizing a New Rutile Substrate for Epitaxial Film Growth

J.T. Heron, E. Kioupakis and R. Hovden (University of Michigan), L.F. Kourkoutis (Cornell University). and T.M. McQueen (Johns Hopkins University)
Here, a team from the University of Michigan came to PARADIM to grow single crystals of rutile-GeO2 motivated by their recent discovery of this new semiconductor—with an ultra-high band gap (4.64 eV), high mobility, high heat conductivity, and desired dopability.
(left) Orientation and debriefing for all attendees at UCLA bookended the Summer School; (right) hands-on training in 3D printing.
Jul 22, 2022
University of California, Santa Barbara

Second BioPACIFIC MIP Summer School

The second annual BioPACIFIC MIP Summer School took place in-person, July 17-22.
Figure: (a-c) Effective pyroelectric coefficients as a function of material thickness for In2Se3, CsBiNb2O7, and ZnO. Light orange arrows are guides for the eyes. d) Comparison of the pyroelectric coefficients and the figures of merit of In2Se3 (11 nm) and ZnO (32 nm) with those of conventional single-crystalline and epitaxial pyroelectric materials.
Jul 20, 2022
Cornell University

Giant Pyroelectric Effect

Jian Shi (Rensselaer Polytechnic Institute)
Here, researchers from RPI came to PARADIM to characterize three model pyroelectric materials whose bonding character varies from a van der Waals material (In2Se3), to a quasi-van der Waals material (CsBiNb2O7), to an ionic/covalent material (ZnO).
By tracking the progression of phase separation, relationships between composition and viscosity are extracted to construct a coacervate phase diagram, accelerating the multi-phase material space discovery.
Mar 30, 2022
University of California, Santa Barbara

High-throughput microscopy to determine morphology, microrheology, and phase boundaries applied to phase separating coacervates

Yimin Luo, Mengyang Gu, Chelsea E. R. Edwards, Megan T. Valentine and Matthew E. Helgeson (UCSB)
A high-throughput characterization platform to achieve simultaneous, in situ mapping of time-evolving morphology and micro-rheology in phase separating complex fluids over a large compositional space.
Figure: (left) Depiction of the atomic arrangement of an aligned WS2/WSe2 moiré superlattice with a graphene layer. Schematics of the assembly of a moiré superlattice sample on a Nb:TiO2 substrate, where WS2, WSe2, and graphene are represented by red, blue, and gray colors, respectively. (right) ARPES spectra with overlaid density functional theory (DFT) calculations of the band structures for individual monolayer graphene (gray), WS2 (red), and WSe2 (blue). The white arrow indicates hybridization between the graphene and transition metal dichalcogenide bands.
Mar 25, 2022
Cornell University

Engineering Quantum Fabrics with Arbitrary Periodicities

Kyle M. Shen,Eun-Ah Kim & Jie Shan (PARADIM), Kin Fai Mak (Cornell), Eli Rotenberg & Aaron Bostwick (Advanced Light Source)
This advance points to a new approach in engineering designer quantum fabrics with arbitrary periodicities, through the coupling of a third layer to an existing moiré heterostructure.

Showing 91 to 100 of 237

This website is supported by the U.S. National Science Foundation under the Materials Innovation Platforms (MIP) program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. National Science Foundation or the participating institutions. This site is maintained collaboratively by teams supported by NSF MIP awards, independent of NSF.