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Highlights

Highlights

(a) Schematic of layered structure, where a gate voltage Vg splits water and injects protons (H+) toward the magnetic cobalt (Co) layer. The magnetization (M) switches between in-plane and out-of-plane depending on the presence or absence of protons, as seen in the hysteresis loops of (b). The magnetization orientation can be switched reversibly as the voltage is toggled (c), for thousands of cycles with no device degradation. X-ray absorption spectroscopy was used to verify the presence of hydrogen in a Pd sensing layer (d).
(a) Schematic of layered structure, where a gate voltage Vg splits water and injects protons (H+) toward the magnetic cobalt (Co) layer. The magnetization (M) switches between in-plane and out-of-plane depending on the presence or absence of protons, as seen in the hysteresis loops of (b). The magnetization orientation can be switched reversibly as the voltage is toggled (c), for thousands of cycles with no device degradation. X-ray absorption spectroscopy was used to verify the presence of hydrogen in a Pd sensing layer (d).
May 16, 2019
Massachusetts Institute of Technology

Electrical control of magnetic properties in thin films by hydrogen gating

Geoffrey Beach and Harry Tuller
INTELLECTUAL MERIT  
(a) Schematic of the light-emitting fiber. Wires (orange) are connected to the LEDs (purple). Photograph of light-emitting fibers containing (b) InGaN blue-colour LEDs, (c) InGaN green LEDs, (d) AlGaAsP red LEDs.  (e) Schematic of the photodetecting fiber structure, where an individual photodiode (orange) detects external light (red arrow). (f) Current–voltage curve of photodetecting fiber, showing clear rectifying behaviour. Black curve: in darkness. Red curve: under illumination. (g) Bandwidth of the photodetecting fibre. The 3 dB bandwidth achieved is around 3 MHz. a.u., arbitrary units.
(a) Schematic of the light-emitting fiber. Wires (orange) are connected to the LEDs (purple). Photograph of light-emitting fibers containing (b) InGaN blue-colour LEDs, (c) InGaN green LEDs, (d) AlGaAsP red LEDs.  (e) Schematic of the photodetecting fiber structure, where an individual photodiode (orange) detects external light (red arrow). (f) Current–voltage curve of photodetecting fiber, showing clear rectifying behaviour. Black curve: in darkness. Red curve: under illumination. (g) Bandwidth of the photodetecting fibre. The 3 dB bandwidth achieved is around 3 MHz. a.u., arbitrary units.
May 16, 2019
Massachusetts Institute of Technology

IRG I: Diode Fibers for Fabric-based Optical Communications

Yoel Fink and John D. Joannopoulos
INTELLECTUAL MERIT
Selection of 3D printed artifacts clockwise from top: flasks & pottery; 3D printer lab; ivory plaque; Buddha heads Image source: Justin Jureller, Jeff Gustafson
Selection of 3D printed artifacts clockwise from top: flasks & pottery; 3D printer lab; ivory plaque; Buddha heads Image source: Justin Jureller, Jeff Gustafson
May 10, 2019
University of Chicago

Oriental Institute Mobile Museum Project

At the University of Chicago MRSEC, we pursued new outreach directions with campus museums including the Smart Museum of Art and the Oriental Institute.
Image sequence of actin droplets (2.6 M, red) severing from a motor cluster (12.3 nM myosin, active, white).
Image sequence of actin droplets (2.6 M, red) severing from a motor cluster (12.3 nM myosin, active, white).
May 10, 2019
University of Chicago

Self-organizing motors divide active liquid droplets

Kimberly L. Weirich (James Franck Institute, University of Chicago) Kinjal Dasbiswas (James Franck Institute, University of Chicago) Thomas A. Witten (James Franck Institute & Dept. of Physics, University of Chicago) Suriyanarayanan Vaikuntanathan (James Franck Institute & Dept. of Chemistry, University of Chicago) Margaret L. Gardel (James Franck Institute & Dept. of Physics, University of Chicago)
At the University of Chicago MRSEC, we have constructed active liquid droplets comprised of the biopolymer actin, crosslinker and molecular motors myosin. The motors spontaneously divide the droplets in half.
Building strongly interacting photonic materials
Building strongly interacting photonic materials
May 10, 2019
University of Chicago

Building strongly interacting photonic materials

Ruichao Ma (University of Chicago) Brendan Saxberg (University of Chicago) Clai Owens (University of Chicago) Nelson Leung (University of Chicago) Yao Lu (University of Chicago) Jonathan Simon (University of Chicago) David I. Schuster (University of Chicago)
A collaboration of the Simon and Schuster groups at the University of Chicago MRSEC  have realized a photonic strongly interacting Mott insulator using a 1D lattice of superconducting qubits.
from J. S. Jeong, H. Song, J. T. Held, K. A. Mkhoyan, Phys. Rev. Lett. 122 (2019).
from J. S. Jeong, H. Song, J. T. Held, K. A. Mkhoyan, Phys. Rev. Lett. 122 (2019).
May 8, 2019
University of Minnesota - Twin Cities

Subatomic Channeling and Spiraling Electron Beams in Crystals

K. Andre Mkhoyan, University of Minnesota
Using analytical aberration-corrected scanning transmission electron microscopy (STEM), we studied the behavior of the electron probe propagating in SrTiO3 at sub-atomic length scales.
(Top) Cationic micelles can be formed via self-assembly from amphiphilic block polymers and complexed with pDNA to form micelleplexes. (Bottom) The number of micelles per micelleplex was estimated using the Mw of the micelleplexes measured by SLS with the assumptions that all micelleplexes are identical and that there are no excess free micelles.
(Top) Cationic micelles can be formed via self-assembly from amphiphilic block polymers and complexed with pDNA to form micelleplexes. (Bottom) The number of micelles per micelleplex was estimated using the Mw of the micelleplexes measured by SLS with the assumptions that all micelleplexes are identical and that there are no excess free micelles.
May 8, 2019
University of Minnesota - Twin Cities

ABC Micelleplexes: Precise Compaction and High Colloidal Stability

Timothy Lodge and Theresa Reineke, University of Minnesota
In this work, the complexation of ABC micelles with a model semiflexible polyion, DNA, is systematically investigated to correlate the structure of the micelle with the properties of the resulting “micelleplexes”.
NSF-MRSEC Booth at the International Materials Research Congress
NSF-MRSEC Booth at the International Materials Research Congress
May 7, 2019
Northwestern University

NSF-MRSEC Booth at the International Materials Research Congress

The NSF-MRSEC booth was featured at the XXVII International Materials Research Congress (IMRC) in Cancun, Mexico on August 19-24, 2018 to increase awareness, promote international collaboration, and broaden participation from traditionally underrepresented groups in the National Science Foundation Materials Research Science and Engineering Center (NSF-MRSEC) program.
Joint Undertaking for an African Materials Institute (JUAMI)
Joint Undertaking for an African Materials Institute (JUAMI)
May 7, 2019
Northwestern University

Joint Undertaking for an African Materials Institute (JUAMI)

The NU-MRSEC has supported Joint Undertaking for an African Materials Institute (JUAMI), which is the largely NSF-funded program aimed at fostering connections between young researchers in the US and those in Eastern Africa.
Research Experience for Undergraduates Plus (REU+)
Research Experience for Undergraduates Plus (REU+)
May 7, 2019
Northwestern University

Research Experience for Undergraduates Plus (REU+)

The new NU-MRSEC REU+ Program enables select REU participants from small colleges to follow their summer experience with an academic quarter at Northwestern University as domestic exchange students, thereby allowing them to experience the rigor of an R1 university in a nurturing environment. REU+ students take classes and also continue their research for an additional ten weeks.

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