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Keynote Presentations

SESSION I KEYNOTE




Coherent Phonons: Elements of an Integrated Circuit Technology?

Dr. James Harvey, Program Manager, U. S. Army Research Office

Coherent phonons have demonstrated a range of phenomena leading to the suspicion that they might play functional roles in integrated circuits. Brief examples of some of these phenomena will be presented. The audience will be challenged to help assess during the workshop the potential for phononic integrated circuits or phononic components of multi-modality integrated circuits. And how would we get there from here?

JAMES HARVEY is ARO’s research program manager for electromagnetics. He has been involved in laser plasma filamentation and USPLs for many years and has conducted laser research at Lawrence Livermore National Laboratory and porous silicon research at ARL. He has also served two tours at the Army’s European Research Office in London. Dr. Harvey holds a B.S. in engineering from the U.S. Military Academy, and M.A. in physics from Dartmouth College, and a Ph.D. in applied science from the University of California, Davis.


SESSION II KEYNOTE


Understanding and Designing Multiferroic Responses of Nanocomposites and Heterostructures Guided by Phase-field Simulations
Dr. Long-Qing Chen, Donald W. Hamer Professor of Materials Science and Engineering, Professor of Engineering Science and Mechnics, and Professor of Mathematics
Penn State Univesity


Multiferroic magnetoelectric nanocomposites or heterostructures are made up of individual ferroelectric and ferromagnetic phases.  They are being explored to significantly improve the performances of or/and to add new functionalities to many existing or emerging devices such as memories, tunable microwave devices, sensors, etc. The multiferrocity of such multiphase materials is achieved through the chemical, mechanical, electric, and or magnetic interfacial coupling across the interphase interfaces, and hence their magnetoelectric effects are expected to strongly depend on the microstructures of nanocomposistes or the geometrical configurations of heterostructures.  In this presentation, we will discuss the recent applications of the phase-field method to modeling, understanding, and predicting the magnetoelectric responses of multiferroic nanocomposites and heterostructures.  In particular, we will discuss strategies of achieving 180 degree magnetic switching through the application of an applied electric field or electric field pulses, switching magnetic skyrmions, and optimizing the magnetoelectric responses of magnetoelectric composites or the performances of heterostructural devices.

LONG-QING CHEN is Donald W. Hamer Professor of Materials Science and Engineering, Professor of Engineering Science and Mechanics, and Professor of Mathematics at Penn State.  He received his Ph.D. from MIT in Materials Science and Engineering in 1990 and joined the faculty at Penn State in 1992. He has published over 500 papers in the area of computational microstructure evolution and multiscale modeling of structural metallic alloys, functional oxide thin films, and energy materials. For his research accomplishments, he has received numerous awards including the 2014 Materials Research Society (MRS) Materials Theory Award, a Guggenheim Fellowship, the Humboldt Senior Research Prize, and the 2011 The Minerals, Metals and Materials Society (TMS) EMPMD Distinguished Scientist Award. He is a Fellow and Life Member of TMS and a Fellow of MRS, American Physical Society (APS), American Ceramic Society (ACerS), and ASM International (ASM). He is the Editor-in-Chief for npj Computational Materials by Nature Research.


SESSION III KEYNOTE



Iron garnets: enabling materials for magnonics, photonics and spintronics

Dr. Caroline A. Ross, Associate Head of the Department of Materials Science and Engineering, Toyota Professor of Materials Science and Engineering
Massachusetts Institute of Technology

Ferromagnetic insulator thin films have emerged as an important component of magnonic, spintronic and magnetooptical devices. Yttrium iron garnet in particular is an excellent insulator with low Gilbert damping and a Néel temperature well above room temperature, and has been incorporated into heterostructures that exhibit a plethora of spintronic and magnonic phenomena including spin pumping, spin Seebeck, proximity effects and spin wave propagation. Epitaxial rare earth garnets can exhibit perpendicular magnetic anisotropy (PMA) of magnetoelastic origin. We demonstrate robust PMA in films of thulium, europium and terbium iron garnet (TmIG, EuIG and TbIG) with high structural quality down to a thickness of 5.6 nm, about 5 unit cells. TmIG/Pt and TbIG/Pt bilayers exhibit a large room temperature anomalous Hall effect which indicates efficient spin transmission across the garnet/Pt interface, and exhibit proximity magnetism in the Pt. Bidirectional switching of the magnetization of TmIG was achieved at room temperature in ns times via spin orbit torque, by passing a current through an adjacent Pt layer in the presence of a fixed in-plane field as low as 2 Oe. Another important aspect of iron garnets is their magnetooptical activity and high transparency in the infrared, which makes them useful materials at communications wavelengths. We show how Ce- and Bi-substituted YIG can be grown on silicon and incorporated into magnetooptical isolators to control the flow of light in photonic integrated circuits.

CAROLINE ROSS is Toyota Professor of Materials Science and Engineering at Massachusetts Institute of Technology. She received her undergraduate and PhD degrees from Cambridge University, UK, was a postdoctoral fellow at Harvard, and worked at Komag, a hard disk company, before joining MIT.

Prof. Ross studies the magnetic properties of thin films and nanostructures for data storage and logic applications, and methods for creating nanoscale structures based on directed self-assembly and lithography.


SESSION IV KEYNOTE



Nano-magnetic Manipulation of Cells

Dr. Dino Di Carlo, Professor, Department of Bioengineering
University of California, Los Angeles

Developing the next generation of tools to automate cell biology research and quantitatively separate the most active cells for cell therapies requires new approaches to interfacing at the cellular and sub-cellular scale. My lab is developing a set of tools to de-amplify macroscale motions and forces to nanoscale perturbations to separate and locally stimulate cells.  I will discuss the core of this platform - a micromagnetic substrate composed of: i) electroplated soft magnetic (NixFey) elements, ii) a biocompatible, planarized resin layer, and iii) lithographically patterned micro-magnet arrays. Magnetizing the micro-magnetic elements with a permanent magnet generates large magnetic potential minima that rapidly and precisely apply magnetic forces on nanoparticles attached to the surface of or inside of cells.  We have used this platform to perform quantitative equilibrium separations of cells based on surface expression by labeling with superparamagnetic nanoparticles as well as select mutant magnetotactic bacteria that produce increased numbers of magnetic nanoparticles. By applying forces on nanoparticles bound to the surface of cortical neurons we were able to control calcium signaling locally within neural networks and bias the direction of neural network growth. By applying forces approaching the yield tension of single cells, we were also able to generate coordinated responses in cellular behavior, including the PAK-dependent generation of active, leading-edge type filopodia, and significant (45 to 90 degree) biasing of the metaphase plate during cell mitosis. The technique shows promise as a tool for cell purification, analysis and engineered control.

DINO DI CARLO received his B.S. in Bioengineering from the University of California, Berkeley in 2002 and received a Ph.D. in Bioengineering from the University of California, Berkeley and San Francisco in 2006. From 2006-2008 he conducted postdoctoral studies in the Center for Engineering in Medicine at Harvard Medical School. He has been on the faculty in the Department of Bioengineering at UCLA since 2008 where he pioneered using inertial fluid dynamic effects for the control, separation, and analysis of cells in microfluidic devices. His work now extends into numerous fields of biomedicine and biotechnology including directed evolution, nano-magnetic cell analysis and control, new amplified molecular assays, next generation biomaterials, and phenotypic drug screening. He has also been active in technology entrepreneurship: He co-founded and currently advises four companies that are commercializing UCLA intellectual property developed in his lab over the last six years (CytoVale, Vortex Biosciences, Tempo Therapeutics, Forcyte, and Ferrologix). Among other honors he received the Presidential Early Career Award for Scientists and Engineers (PECASE) was elected a Fellow the American Institute for Medical and Biological Engineering (AIMBE) and of the Royal Society of Chemistry (FRSC). He also has been honored by academic societies across a range of fields with the Pioneers of Miniaturization Prize, the Materials Research Society (MRS) Outstanding Young Investigator Award and the Analytical Chemistry Young Innovator Award. He was awarded the National Science Foundation (NSF) Faculty Early Career Development award, the U.S. Office of Naval Research (ONR) Young Investigator Award, and the Packard Fellowship. His translational research was also supported by the Defense Advanced Research Projects Agency (DARPA) Young Faculty Award, the National Institutes of Health (NIH) Director’s New Innovator Award and Coulter Translational Research Award.