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Highlights

Highlights

Magnetic structure of hexagonal ytterbium ferrite (h-YbFeO3) in which iron (Fe) magnetic moments (indicated by blue arrows) are anti-aligned to ytterbium (Yb) magnetic moments (indicated by grey arrows), thus revealing ferrimagnetism of multiferroic hexagonal ferrite h-YbFeO3.
Magnetic structure of hexagonal ytterbium ferrite (h-YbFeO3) in which iron (Fe) magnetic moments (indicated by blue arrows) are anti-aligned to ytterbium (Yb) magnetic moments (indicated by grey arrows), thus revealing ferrimagnetism of multiferroic hexagonal ferrite h-YbFeO3.
Apr 25, 2018
University of Nebraska - Lincoln

Direct Observation of Ferrimagnetism in a Multiferroic Hexagonal Ferrite

Xiaoshan Xu, Peter Dowben, and Evgeny Tsymbal (University of Nebraska-Lincoln)
Multiferroics is a class of materials that exhibits a coexistence of electric and magnetic polarizations.  Coupling of these polarizations is potentially useful for energy-efficient information storage and processing. Hexagonal rare-earth ferrites (h-RFeO3, where R is rare-earth element and Fe is iron) are new family of multiferroic materials. Magnetic interactions between rare-earth and iron ions in h-RFeO3, may amplify the weak ferromagnetic moment of iron, making these materials more appealing as multiferroics.
Modelled corrugation of a BCN monoatomic layer on iridium (Ir) surface, where red (blue) colors indicate high (low) BCN elevations. “h”, “H”, and “T” sites refer to the position of the B and N atoms with respect to the Ir substrate atoms. The top left panel shows the scanning tunneling microscopy image of the simulation cell.
Modelled corrugation of a BCN monoatomic layer on iridium (Ir) surface, where red (blue) colors indicate high (low) BCN elevations. “h”, “H”, and “T” sites refer to the position of the B and N atoms with respect to the Ir substrate atoms. The top left panel shows the scanning tunneling microscopy image of the simulation cell.
Apr 25, 2018
University of Nebraska - Lincoln

Nebraska MRSEC Facility: Synthesis and Characterization of Graphene-Like Boron-Carbon-Nitrogen Monolayers

Axel Enders, Peter Dowben, and Alexander Sinitskii (University of Nebraska-Lincoln)
The emergence of two-dimensional (2D) materials, which are only one atom or one structural unit cell thick, has stimulated an enormous range of research effort. The well-known example is graphene – a zero band gap semiconductor, which exhibits outstanding charge carrier mobility. However, the absence of a band gap is a major hindrance in implementing graphene in 2D electronics. The question arises whether other graphenic systems of mono-atomic thickness, with useful electronic properties, can be realized.
Electron microscope image of a 1-D channel of molybdenum disulfide embedded in 2-D tungsten diselenide. The blue/green dots are tungsten and selenium atoms; the magenta dots are sulfur atoms. The entire film is three atoms thick.
Electron microscope image of a 1-D channel of molybdenum disulfide embedded in 2-D tungsten diselenide. The blue/green dots are tungsten and selenium atoms; the magenta dots are sulfur atoms. The entire film is three atoms thick.
Feb 12, 2018
Cornell University

Threading Atom-Wide Wires Into 2D Materials

Cornell University researchers and collaborators have discovered – somewhat accidentally – a method for inserting a one-dimensional (1D) semiconductor channel into the “fabric” of a material that is only a few atoms thick.
Día De la Ciencia / Science Day - bilingual event at Princeton's MRSEC
Día De la Ciencia / Science Day - bilingual event at Princeton's MRSEC
Aug 23, 2017
Princeton University

Día De la Ciencia / Science Day - bilingual event at Princeton's MRSEC

Daniel Steinberg, Princeton Center for Complex Materials (PCCM)  
On April 8, 2017, PCCM held its first Día de la Ciencia at the Princeton Public Library. Forty scientists set up 20 table presentations and met with over 500 members of the community. In an attempt to improve outreach to all members of the community, PCCM organized the Día de la Ciencia event to reach the large Latino/Latina population in the town of Princeton, NJ and surrounding region. PCCM piloted Día de la Ciencia with science demos and had at least one Spanish speaking presenter at each table.
PCCM has helped industrial partners to many innovations and new product developments. PCCM would like to continue its efforts of developing the Imaging and Analysis Center (IAC) as an engine of education, innovation and economic growth.
PCCM has helped industrial partners to many innovations and new product developments. PCCM would like to continue its efforts of developing the Imaging and Analysis Center (IAC) as an engine of education, innovation and economic growth.
Aug 23, 2017
Princeton University

Imaging and Analysis Center Partners with Industry and Other Institutions

Nan Yao (Princeton University)
The Imaging and Analysis Center (IAC) supported by PCCM is a world-leading facility for materials characterization. It is a critical resource to our industrial user community. The advanced instrumentation and expertise in the IAC provide ultimate opportunity for us to actively interact with industrial scientists. IAC conducts a series of short courses (required for instrument access), which involve direct experimental demonstrations and hands-on instruction, ranging from basic sample preparation devices to high-end electron microscopes.
Stars of Materials Science 2017 with Cliff Brangwynne and Rod Priestley.
Stars of Materials Science 2017 with Cliff Brangwynne and Rod Priestley.
Aug 23, 2017
Princeton University

Stars of Materials Science with Professors Cliff Brangwynne and Rod Priestley

Daniel Steinberg, Princeton Center for Complex Materials (PCCM)  
On April 1, 2017 over 500 people visited Princeton University to learn about polymers from Princeton Center for Complex Materials researchers. Members of the NSF funded MRSEC in Interdisciplinary Research Group 2 presented a multimedia demonstration and lecture featuring audience participation. Rod Priestley and Cliff Brangwynne spent months developing the presentation that explained the basics of polymers, discussed their career paths in science and overviewed their MRSEC research on a level that a 5 year old to an adult could understand and appreciate.
New Color Centers in Diamond for Quantum Information Science
New Color Centers in Diamond for Quantum Information Science
Aug 23, 2017
Princeton University

New Color Centers in Diamond for Quantum Information Science

Nathalie P. de Leon and Stephen A. Lyon (Princeton University)
Color centers in diamond are a promising platform for quantum information science, as they can serve as solid state quantum bits with efficient optical transitions. Much recent attention has focused on the negatively charged NV center in diamond, which can be measured and initialized optically, exhibits long spin coherence times at room temperature, and has narrow, spin-conserving optical transitions.
Fig. 1 Optical micrograph of a superconducting photonic bandgap microresonator. This resonator geometry was a key advancement that enabled the study of electrically driven NMR Fig. 2 Density plots showing coherent manipulation of 75As and 31P nuclear spins using only RF electric fields. Rabi oscillation” between the two spin states appear as the electric field control pulse amplitude or length is varied.
Fig. 1 Optical micrograph of a superconducting photonic bandgap microresonator. This resonator geometry was a key advancement that enabled the study of electrically driven NMR Fig. 2 Density plots showing coherent manipulation of 75As and 31P nuclear spins using only RF electric fields. Rabi oscillation” between the two spin states appear as the electric field control pulse amplitude or length is varied.
Aug 23, 2017
Princeton University

Electrical Manipulation of Nuclear Spins in Silicon

A. J. Sigillito, A. M. Tyryshkin, T. Schenkel, A. A. Houck, and S. A. Lyon, Princeton University
The spin degree of freedom for donor nuclei in silicon have exceptionally long coherence times making them useful as either quantum bits (qubits) or long-lived quantum memories. Nuclear spins are hard to control in nanoscale devices since they are thought to only be coherently manipulated using magnetic fields, which are hard to confine. In this collaboration, researchers in IRG3 identify two new physical mechanisms that allow for manipulation of nuclear spins using only electric fields.
Our findings will lead to a better understanding of the combined roles of interfaces, confinement and self-concentration effects on the properties of internally nanostructured polymers. The results will guide the development of next-generation copolymers with tunable interfacial properties.
Our findings will lead to a better understanding of the combined roles of interfaces, confinement and self-concentration effects on the properties of internally nanostructured polymers. The results will guide the development of next-generation copolymers with tunable interfacial properties.
Aug 22, 2017
Princeton University

Direct Measurement of the Local Glass Transition in Nanophase Structured Copolymers with One Nanometer Resolution

R.A. Register (Princeton) and R. D. Priestley (Princeton)
Block copolymers, which self-assemble into nanostructures due to the incompatibility of each block, have generated intense scientific interest and are used in a myriad of important technologies.  In such systems, the majority of the macromolecules can lie within a few nanometers of an internal interface, within a region where the dynamics and mechanical properties can be highly modified from their bulk values.
We expect that this study will provide insight into the design of next-generation industrial polymer processing, where nanoscale control of the structural heterogeneities of semi-crystalline phase is crucial.
We expect that this study will provide insight into the design of next-generation industrial polymer processing, where nanoscale control of the structural heterogeneities of semi-crystalline phase is crucial.
Aug 22, 2017
Princeton University

Dramatic Tunability in Melting Temperature and Crystallinity of Polyethylene by Exploiting Confinement During Processing

R. D. Priestley (Princeton), C. B. Arnold(Princeton), Y.-L. Loo(Princeton) and R. A. Register (Princeton).
We exploited Matrix Assited Pulsed Laser Evaporation (MAPLE) to deposit polyethylene from a quasi-vapor phase at a controlled substrate temperature, to crystallize polymers under confinement at a wide range of target crystallization temperature, Tc.  The team showed the remarkable controllability of the semi-crystalline structure of PE by MAPLE with the control of substrate temp.; see Figure A and B. In comparison to melt-crystallized PE (Fig.

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