Amorphous States of Phase Change Materials: Effects of Cooling Rate and Composition Stephen G. Bishop, University of Illinois at Urbana-Champaign, DMR.

Slides:

Advertisements

Similar presentations

By Stephen Hudson, M.Ed The Design and Technology Roosevelt High School North East ISD, San Antonio With Faculty Mentor Haiyan Wang, PhD Department.

Advertisements

MRI: Acquisition of a State-of-the-Art Aberration-Corrected Analytical Electron Microscope with Enhanced Atomic-Level Spectrometry and Low-Voltage Performance.

GIANT MAGENTORESISCANCE AND MAGNETIC PROPERTIES OF ELECTRODEPOSITED Ni-Co-Cu/Cu MULTILAYERS.

Structural Properties of Electron Beam Deposited CIGS Thin Films Author 1, Author 2, Author 3, Author 4 a Department of Electronics, Erode Arts College,

Project Objectives  A three-year research project on nanotribology of ultra-thin wear and oxidation resistant hard coatings was been initiated.  The.

Synthesis and characterisation of thin film MAX phase alloys Mathew Guenette, Mark Tucker, Yongbai Yin, Marcela Bilek, David McKenzie Applied and Plasma.

Metal-insulator thin films have been studied for making self-patterning nano-templates and for controlling attachment strength on template surfaces. These.

Region of maximum conductivity 1% 88% 2%31% 54% 64% 1% Fraction crystallinity Solid polymer electrolytes for lithium ion batteries Janna K. Maranas, Pennsylvania.

S. Kugler: Lectures on Amorhous Semiconductors 1 Preparation.

Holistic approach to mentoring (teaching and research) next-generation scientists & engineers J. Narayan Department of Materials Science and Engineering.

Presented by Anas Mazady, Cameron Fulton, Nicholas Williams University of Connecticut Department of Electrical and Computer Engineering Thursday, April.

National Science Foundation Materials World Network-- Ultrafast Switching of Phase Change Materials: Combined Nanosecond and Nanometer Exploration Bryan.

NANOFABRICATION -3 NOVEL PROCESSES EEE5425 Introduction to Nanotechnology1.

Force chemical mixing during severe plastic deformation Robert S. Averback, University of Illinois at Urbana-Champaign, DMR Understanding how atoms.

CHESS DMR Versatile polymer film synthesis method invented Joel Brock, Cornell University, DMR Pliable scaffolds with structural hierarchy.

Multiscale Simulation of Phase Change Memory (PCM) Manjeri P. Anantram, University of Washington, DMR O Ba Sr Si To probe the ultimate scalability.

Strong, Ductile and Low-Field Magnetostrictive Alloys Based on Fe-Ga PI: Sivaraman Guruswamy, University of Utah MET DMR Award # Technical and.

Quantum Electronic Structure of Atomically Uniform Pb Films on Si(111) Tai C. Chiang, U of Illinois at Urbana-Champaign, DMR Miniaturization of.

Interfacial Characteristics of Semi fluorinated Polymers Dvora Perahia (Clemson University) DMR Thin layers of semifluorinated and fluorinated.

FRG: M n+1 AX n Phase Solid Solutions: Unique Opportunities at Engineering Bulk and Surface Properties Micheal W. Barsoum, Drexel University, DMR

Relations between Structure, Phase Formation and Phase Transitions in Supercooled Metallic Liquids and Glasses Kenneth F. Kelton, Washington University,

Fabrication and Properties of MSMA Thin Films Hierarchical Manufacturing and Modeling for Phase Transforming Active Nanostructures D.C. Lagoudas a, K.

AlGaN/InGaN Photocathodes D.J. Leopold and J.H. Buckley Washington University St. Louis, Missouri, U.S.A. Large Area Picosecond Photodetector Development.

National Science Foundation Structure and Reactivity of Nano-scale Holes in Single Sheet BN: Experiment and Theory Andre Mkhoyan, University of Minnesota-twin.

Influence of Switch Frequency on the Morphology of PP/EPR In-reactor Alloys Prepared by Periodic Switching Polymerization Reza Mehtarani ( ) Supervisor:

Determining Chemical Order Parameter from Small Volumes Gregory B. Thompson, University of Alabama Tuscaloosa, DMR Intellectual Merit Ta enrichment.

Microstructural Engineering of Shape Memory Thin Films & Nanowires Ainissa G. Ramirez, Yale University, DMR Motivation Thin film shape memory alloys.

National Science Foundation Enhanced Pyroelectric and Electrocaloric Effects in Complex Oxide Thin Film Heterostructures Lane W. Martin, University of.

Fabrication of oxide nanostructure using Sidewall Growth 田中研 M1 尾野篤志.

A Presentation on “OUM “ “(OVONIC UNIFIED MEMORY)” Submitted by: Aakash Singh Chauhan (CS 05101)

National Science Foundation Outcome: Unique vertical aligned nanocomposite thin films with multifunctionalities Impact: Highly strained and ordered nanostructured.

Nanoscale Self-Organization of Metallic Alloys under Ion Irradiation Robert Averback and Pascal Bellon, University of Illinois, MET DMR Award#

Icosahedral Short Range order and Bulk Glass Formation Kenneth F. Kelton, Washington University, DMR Primary goal – To study ordering in supercooled.

Collaborative Research: Analysis of Defects and Their Causes in Bulk Aluminum Nitride Crystals – Jharna Chaudhuri, Texas Tech University, Lubbock, TX DMR

Nanoscale Segregation in Next-generation Hard-Drive Thin Films Gregory B. Thompson, University of Alabama, Tuscaloosa, DMR Intellectual Merit Research.

Formation of Ge alloy nanocrystals embedded in silica Eugene E. Haller, University of California-Berkeley, DMR Ge-Au particles Above: Transmission.

Reminders Quiz#2 and meet Alissa and Mine on Wednesday –Quiz covers Bonding, 0-D, 1-D, 2-D, Lab #2 –Multiple choice, short answer, long answer (graphical.

Role of Glass Composition in Waveguide Fabrication with Femtosecond Laser Pulses Denise Krol, University of California, Davis, DMR Tightly focused.

National Science Foundation Mechanical Forces That Change Chemistry Brian W. Sheldon, Brown University, DMR Outcome: Research at Brown University.

Electronic Properties of Thin Film Organic Superconductors studied using Synchrotron Radiation-based Soft X-Ray Spectroscopies Kevin E. Smith, Boston University,

Effect of Thermal Quench on Ferroelectric Domain Structures in Two-Dimensional Polymers Xia Hong, University of Nebraska-Lincoln, DMR Understanding.

Direct visualization of nanoscale structural domains in complex sulfide glasses Sabyasachi Sen (University of California at Davis), DMR The existence.

National Science Foundation GOALI: Epitaxial Growth of Perovskite Films and Heterostructures by Atomic Layer Deposition and Molecular Beam Epitaxy John.

University of Arkansas Fayetteville, Arkansas Plasma Diagnostics for the Deposition of Nanomaterials (Alumina) Jay Mehta Undergraduate.

Meta-stable Sites in Amorphous Carbon Generated by Rapid Quenching of Liquid Diamond Seung-Hyeob Lee, Seung-Cheol Lee, Kwang-Ryeol Lee, Kyu-Hwan Lee, and.

EPITAXIAL GROWTH AND CHARACTERIZATION OF HIGH QUALITY CdTe (111) VIA CLOSED-SPACE SUBLIMATION A. Escobedo, J.C. McClure, D. Zubia University of Texas El.

Negative Capacitance Devices to Enable Low- Voltage/Low-Power Switching In Electronic Devices John G. Ekerdt, University of Texas at Austin, DMR

The Role of Surface-Energy on Texture Development in Rare-Earth-Free Auxetic and Magnetostrictive Materials Alison B. Flatau, University of Maryland College.

CAREER: Synthesis and Electronic/Electrical Properties of Carbon Nanotube Junctions Wenzhi LiFlorida International UniversityDMR One of the objectives.

Award Title: M n+1 AX n Phase Solid Solutions: Unique Opportunities at Engineering Bulk and Surface Properties Michel W. Barsoum, Drexel University, DMR.

From: S.Y. Hu Y.C. Lee, J.W. Lee, J.C. Huang, J.L. Shen, W.

Strong, Ductile and Low-Field Magnetostrictive Alloys Based on Fe-Ga Sivaraman Guruswamy, University of Utah DMR Technical and Scientific Impact.

CAREER: Robust Thin Film Shape Memory Alloys for MEMS Ainissa G. Ramirez, Yale University, DMR Motivation Thin film shape memory alloys are potential.

Structure–Composition-Magnetostriction Correlations in Strong and Ductile Fe-Based Alloys with Large Low-Field Magnetostriction Structure–Composition-Magnetostriction.

Objectives: To study diffusion reactions at planar aluminum-spinel (Al–MgAl 2 O 4 ) interfaces. To investigate the effect of an external electric field.

EBB 511 – Materials Characterization

NSF-Europe Materials Collaboration: Self-Organized Nanostructured Thin Films for Catalysis in Perovskite Related Membrane Reactors Jagannathan Sankar,

Nuclear magnetic resonance study of organic metals Russell W. Giannetta, University of Illinois at Urbana-Champaign, DMR Our lab uses nuclear magnetic.

Investigation of Half-Metallic Magnetic Oxides Jinke Tang, University of Wyoming, DMR Polytetrafluoroethylene (C n F 2n+2 ), also known as Teflon,

Enhanced hardness and fracture toughness of the laser-solidified FeCoNiCrCuTiMoAlSiB 0.5 high-entropy alloy by martensite strengthening Advisor : Tzu-Yao.

This is standard 4-point probe configuration. You can source current through the left probes and measure the voltage through the right probes. OPTICAL.

Comparison b/w light and electron microscopes LIGHT MICROSCOPE ELECTRON MICROSCOPE Magnification can be done upto 2000 times Resolving power is less.

MIT Amorphous Materials 4: Phase Change Data Storage Juejun (JJ) Hu 1.

Li Zeng1, M. Moghadam1, D. Buchholz1, D. Keane3, Tobin J

Introduction Thin films of hydrogenated amorphous silicon (a-Si:H) are used widely in electronic, opto-electronic and photovoltaic devices such as thin.

Comparative analysis of some

Investigation of the microstructure in the Yttrium-Tantalate-Zirconia system Thursday, August 27, 2015.

Prepared by Dr Diane Aston, IOM3

MIT Amorphous Materials 4: Phase Change Data Storage

Amorphous to Crystalline Transition in Indium Oxide Semiconductors

Presentation transcript:

Amorphous States of Phase Change Materials: Effects of Cooling Rate and Composition Stephen G. Bishop, University of Illinois at Urbana-Champaign, DMR Phase change memory (PCM) materials that can be rapidly switched between amorphous and crystalline states are under development for next-generation non-volatile memories. We have demonstrated that Fluctuation Transmission Electron Microscopy (FTEM) can detect the nanoscale nuclei content in glassy films of chalcogenide PCM materials. Correlation of FTEM results with pulsed laser crystallization experiments allows us to determine the role of the nuclei in crystallization. A study of these phenomena as a function of sample composition, deposition conditions, capping materials, thermal annealing, and melt-quenching can probe the predictions of classical nucleation theory and guide the search for optimal PCM materials. Results: Phase transformation of PCM materials from the crystalline to amorphous state requires rapid melt-quenching, and our recent FTEM studies detected higher subcritical nuclei content in melt-quenched amorphous Ge 2 Sb 2 Te 5 (GST) samples than in as-deposited samples (figure (a)). For the case of nitrogen-alloyed GST, FTEM provides proof that the subcritical nuclei content is severely reduced as the nitrogen content is increased in as-deposited samples (figure (b)). Significance: This study demonstrates that the amount of subcritical nuclei embedded in the melt-quenched amorphous state depends on the cooling rate. Nucleation rate in GST is fast so that subcritical nuclei may form and grow during melt quenching. In addition, the reduction of subcritical nuclei content detected by FTEM in as-deposited films of nitrogen-alloyed GST is consistent with the slower crystallization rates observed for these materials. These results suggest that FTEM might be a valuable tool in the search for better performance in PCM materials. Future: Studies of heterogeneous vs. homogeneous nucleation in capped phase change samples are in progress. Comparison of subcritical nuclei content in various chalcogenide glass compositions is planned. (a) (b) (a) FTEM variance in melt-quenched GST film shows larger subcritical nuclei content than as-deposited GST. (b) Nitrogen alloying of GST reduces the subcritical nuclei content in as-deposited samples.

Amorphous States of Phase Change Materials: Effects of Cooling Rate and Composition Stephen G. Bishop, University of Illinois at Urbana-Champaign, DMR Results published in “Fluctuation Transmission Electron Microscopy: Detecting Nanoscale Order in Disordered Structures,” Bong-Sub Lee, Stephen G. Bishop, and John R. Abelson, ChemPhysChem 2010, 11, Results presented in Materials Research Society Spring Meeting, San Francisco, USA, 2010 Our paper “Observation of the Role of Subcritical Nuclei in Crystallization of a Glassy Solid,” Bong-Sub Lee, Geoffrey W. Burr, Robert M. Shelby, Simone Raoux, Charles T. Rettner, Stephanie N. Bogle, Kristof Darmawikarta, Stephen G. Bishop, and John R. Abelson, Science 326, 980 (2009), has won the IBM Materials Research Community’s Sixth Annual Materials Research Best Paper Award. The competition was for materials science and engineering papers published in 2009 authored or co-authored by IBM researchers (our collaborators). Established Fluctuation Transmission Electron Microscopy in the new state of the art Aberration Corrected TEM, JEOL 2200FS. Close collaboration with IBM Almaden Research Center & IBM T. J. Watson Research Center (simulation, pulsed laser experiments, device sample preparation); with John Abelson (fluctuation electron microscopy to analyze nanoscale structural properties, supported by grant DMR ). Graduate students trained on transmission electron microscopy (especially fluctuation electron microscopy), nanocalorimetry, scanning electron microscopy, pump-probe laser technique, x-ray diffraction, x-ray reflection, atomic force microscopy, profilometry, thin film deposition by rf/dc magnetron sputtering, and evaporation. Broader Impacts