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Electron Microscopy Characterization And Structure Optimatization Of Fept Self Assembled Nanoparticles For Ultrahigh Density Magnetic Data Storage
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Book Synopsis Electron Microscopy Characterization and Structure Optimatization of FePt Self-assembled Nanoparticles for Ultrahigh-density Magnetic Data Storage by : Mihaela Tanase
Download or read book Electron Microscopy Characterization and Structure Optimatization of FePt Self-assembled Nanoparticles for Ultrahigh-density Magnetic Data Storage written by Mihaela Tanase and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural and Magnetic Model of Self-assembled FePt Nanoparticle Arrays by :
Download or read book Structural and Magnetic Model of Self-assembled FePt Nanoparticle Arrays written by and published by . This book was released on 2004 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemically ordered, self-assembled FePt nanoparticle arrays with high magnetic anisotropy are considered a candidate medium for data storage beyond 1 Tbit/in2. We report comprehensive structural and magnetic studies on thin (3 layer) assemblies of polyethylenimine (PEI) and 4 nm Fe5Pt42 nanoparticles using X-ray diffraction, small angle neutron scattering and magnetometry. We show that prior to annealing FePt nanoparticles in the PEI-FePt assembly consist of a metallic, magnetic core surrounded by a weakly magnetic or non-magnetic shell. High temperature annealing creates the desired L10 chemical ordering and results in high coercivity FePt nanoparticles. However, we find that the high temperatures necessary to establish full chemical ordering leads to particle sintering and agglomeration. Understanding the magnetic and physical properties of these assemblies allows future research directions to be clarified for nanoparticle arrays as data storage media.
Book Synopsis Structural and Magnetic Characterization of Self-assembled Magnetic Nanoparticles by : Durgamadhab Mishra
Download or read book Structural and Magnetic Characterization of Self-assembled Magnetic Nanoparticles written by Durgamadhab Mishra and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scanning Transmission Electron Microscopy by : Alina Bruma
Download or read book Scanning Transmission Electron Microscopy written by Alina Bruma and published by CRC Press. This book was released on 2020-12-22 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning Transmission Electron Microscopy: Advanced Characterization Methods for Materials Science Applications The information comprised in this book is focused on discussing the latest approaches in the recording of high-fidelity quantitative annular dark-field (ADF) data. It showcases the application of machine learning in electron microscopy and the latest advancements in image processing and data interpretation for materials notoriously difficult to analyze using scanning transmission electron microscopy (STEM). It also highlights strategies to record and interpret large electron diffraction datasets for the analysis of nanostructures. This book: Discusses existing approaches for experimental design in the recording of high-fidelity quantitative ADF data Presents the most common types of scintillator-photomultiplier ADF detectors, along with their strengths and weaknesses. Proposes strategies to minimize the introduction of errors from these detectors and avenues for dealing with residual errors Discusses the practice of reliable multiframe imaging, along with the benefits and new experimental opportunities it presents in electron dose or dose-rate management Focuses on supervised and unsupervised machine learning for electron microscopy Discusses open data formats, community-driven software, and data repositories Proposes methods to process information at both global and local scales, and discusses avenues to improve the storage, transfer, analysis, and interpretation of multidimensional datasets Provides the spectrum of possibilities to study materials at the resolution limit by means of new developments in instrumentation Recommends methods for quantitative structural characterization of sensitive nanomaterials using electron diffraction techniques and describes strategies to collect electron diffraction patterns for such materials This book helps academics, researchers, and industry professionals in materials science, chemistry, physics, and related fields to understand and apply computer-science–derived analysis methods to solve problems regarding data analysis and interpretation of materials properties.
Author :Royal Society of Chemistry (Great Britain) Publisher :Royal Society of Chemistry ISBN 13 :0854042415 Total Pages :319 pages Book Rating :4.8/5 (54 download)
Book Synopsis Nanocharacterisation by : Royal Society of Chemistry (Great Britain)
Download or read book Nanocharacterisation written by Royal Society of Chemistry (Great Britain) and published by Royal Society of Chemistry. This book was released on 2007 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocharacterisation is a rapidly developing field. Contributions in this book from across the globe provide an overview of the different microscopic techniques for the characterisation of nanostructures.
Book Synopsis Scanning Microscopy for Nanotechnology by : Weilie Zhou
Download or read book Scanning Microscopy for Nanotechnology written by Weilie Zhou and published by Springer Science & Business Media. This book was released on 2007-03-09 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents scanning electron microscopy (SEM) fundamentals and applications for nanotechnology. It includes integrated fabrication techniques using the SEM, such as e-beam and FIB, and it covers in-situ nanomanipulation of materials. The book is written by international experts from the top nano-research groups that specialize in nanomaterials characterization. The book will appeal to nanomaterials researchers, and to SEM development specialists.
Book Synopsis Advanced Electron Microscopy and Nanomaterials by : Arturo Ponce
Download or read book Advanced Electron Microscopy and Nanomaterials written by Arturo Ponce and published by Trans Tech Publications Ltd. This book was released on 2010-03-02 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected, peer reviewed papers from the First Joint Advanced Electron Microscopy School for Nanomaterials and the Workshop on Nanomaterials (AEM-NANOMAT’09), Saltillo (Coahuila) México, September 29th-October 2nd, 2009
Book Synopsis Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles by : Sebastian Ekeroth
Download or read book Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles written by Sebastian Ekeroth and published by Linköping University Electronic Press. This book was released on 2019-11-08 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials are important tools for enabling technological progress as they can provide dramatically different properties as compared to the bulk counterparts. The field of nanoparticles is one of the most investigated within nanomaterials, thanks to the existing, relatively simple, means of manufacturing. In this thesis, high-power pulsed hollow cathode sputtering is used to nucleate and grow magnetic nanoparticles in a plasma. This sputtering technique provides a high degree of ionization of the sputtered material, which has previously been shown to aid in the growth of the nanoparticles. The magnetic properties of the particles are utilized and makes it possible for the grown particles to act as building blocks for self-assembly into more sophisticated nano structures, particularly when an external magnetic field is applied. These structures created are termed “nanowires” or “nanotrusses”, depending on the level of branching and inter-linking that occurs. Several different elements have been investigated in this thesis. In a novel approach, it is shown how nanoparticles with more advanced structures, and containing material from two hollow cathodes, can be fabricated using high-power pulses. The dual-element particles are achieved by using two distinct and individual elemental cathodes, and a pulse process that allows tuning of individual pulses separately to them. Nanoparticles grown and investigated are Fe, Ni, Pt, Fe-Ni and Ni-Pt. Alternatively, the addition of oxygen to the process allows the formation of oxide or hybrid metal oxide – metal particles. For all nanoparticles containing several elements, it is demonstrated that the stoichiometry can be easily varied, either by the amount of reactive gas let into the process or by tuning the amount of sputtered material through adjusting the electric power supplied to the different cathodes. One aim of the presented work is to find a suitable material for the use as a catalyst in the production of H2 gas through the process of water splitting. H2 is a good candidate to replace fossil fuels as an energy carrier. However, rare elements (such as Ir or Pt) needs to be used as the catalyst, otherwise a high overpotential is required for the splitting to occur, leading to a low efficiency. This work demonstrates a possible route to avoid this, by using nanomaterials to increase the surface-to-volume ratio, as well as optimizing the elemental ratio between different materials to lower the amount of noble elements required.
Book Synopsis X-ray Studies of Magnetic Nanoparticle Assemblies by :
Download or read book X-ray Studies of Magnetic Nanoparticle Assemblies written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monodisperse FePt nanoparticles were prepared using high temperature solution phase synthesis. Polymer-mediated layer-by-layer growth leads to precise control of the particle self-assembly. The narrow particle size distribution ([sigma] ≤ 5%) offers the potential for increased data storage density by utilizing a smaller mean particle size and ultimately storage of one bit per individual nanoparticle. We have studied self-assembled multilayers of magnetic FePt nanoparticles. The L10 phase of FePt has a very high magnetic anisotropy which allows the magnetization of particles of about 4 nm diameter to be thermally stable at room temperature. Magnetic measurements using vibrating sample magnetometer were combined with X-ray diffraction (XRD) and Near Edge X-ray Absorption Fine Structure (NEXAFS) Spectroscopy to study the annealed FePt nanoparticle assemblies and to optimize annealing conditions. NEXAFS spectra showed that a fraction of the iron in the as-deposited particles was oxidized, and this fraction was reduced by annealing in inert or reducing atmospheres. A very thin layer (
Book Synopsis Transmission Electron Microscopy Characterization of Nanomaterials by : Challa S.S.R. Kumar
Download or read book Transmission Electron Microscopy Characterization of Nanomaterials written by Challa S.S.R. Kumar and published by Springer Science & Business Media. This book was released on 2013-12-09 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: Third volume of a 40volume series on nanoscience and nanotechnology, edited by the renowned scientist Challa S.S.R. Kumar. This handbook gives a comprehensive overview about Transmission electron microscopy characterization of nanomaterials. Modern applications and state-of-the-art techniques are covered and make this volume an essential reading for research scientists in academia and industry.
Book Synopsis Structure Analysis of Advanced Nanomaterials by : Takeo Oku
Download or read book Structure Analysis of Advanced Nanomaterials written by Takeo Oku and published by Walter de Gruyter GmbH & Co KG. This book was released on 2014-10-09 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-resolution electron microscopy allows the imaging of the crystallographic structure of a sample at an atomic scale. It is a valuable tool to study nanoscale properties of crystalline materials such as superconductors, semiconductors, solar cells, zeolite materials, carbon nanomaterials or BN nanotubes.
Book Synopsis Functional Nanostructures Fabricated by Focused Electron/Ion Beam Induced Deposition by : Rosa Córdoba Castillo
Download or read book Functional Nanostructures Fabricated by Focused Electron/Ion Beam Induced Deposition written by Rosa Córdoba Castillo and published by Springer Science & Business Media. This book was released on 2013-10-08 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis constitutes a detailed study of functional nanostructures (ferromagnetic, superconducting, metallic and semiconducting) fabricated by focused electron/ion beam induced deposition techniques. The nanostructures were grown using different precursor materials such as Co2(CO)8, Fe2(CO)9, W(CO)6, (CH3)3Pt(CpCH3) and were characterized by a wide range of techniques. This work reports results obtained for the morphology, the microstructure, the composition, the electrical transport mechanism, magnetic and superconducting properties of nanostructures. The results offers exciting prospects in a wide range of applications in nanotechnology and condensed matter physics.
Book Synopsis Progress in Nanoscale Characterization and Manipulation by : Rongming Wang
Download or read book Progress in Nanoscale Characterization and Manipulation written by Rongming Wang and published by Springer. This book was released on 2018-08-30 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on charged-particle optics and microscopy, as well as their applications in the materials sciences. Presenting a range of cutting-edge theoretical and methodological advances in electron microscopy and microanalysis, and examining their crucial roles in modern materials research, it offers a unique resource for all researchers who work in ultramicroscopy and/or materials research. The book addresses the growing opportunities in this field and introduces readers to the state of the art in charged-particle microscopy techniques. It showcases recent advances in scanning electron microscopy, transmission electron microscopy and helium ion microscopy, including advanced spectroscopy, spherical-corrected microscopy, focused-ion imaging and in-situ microscopy. Covering these and other essential topics, the book is intended to facilitate the development of microscopy techniques, inspire young researchers, and make a valuable contribution to the field.
Book Synopsis Scanning Transmission Electron Microscopy Of Nanomaterials: Basics Of Imaging And Analysis by : Nobuo Tanaka
Download or read book Scanning Transmission Electron Microscopy Of Nanomaterials: Basics Of Imaging And Analysis written by Nobuo Tanaka and published by World Scientific. This book was released on 2014-08-21 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: The basics, present status and future prospects of high-resolution scanning transmission electron microscopy (STEM) are described in the form of a textbook for advanced undergraduates and graduate students. This volume covers recent achievements in the field of STEM obtained with advanced technologies such as spherical aberration correction, monochromator, high-sensitivity electron energy loss spectroscopy and the software of image mapping. The future prospects chapter also deals with z-slice imaging and confocal STEM for 3D analysis of nanostructured materials.
Book Synopsis The Use of Liquid Phase Transmission Electron Microscopy for Quantifying Interactions Between Colloidal Nanoparticles and Visualizing Their Self-Assembled Structures by : Hoduk Cho
Download or read book The Use of Liquid Phase Transmission Electron Microscopy for Quantifying Interactions Between Colloidal Nanoparticles and Visualizing Their Self-Assembled Structures written by Hoduk Cho and published by . This book was released on 2018 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract The Use of Liquid Phase Transmission Electron Microscopy for Quantifying Interactions Between Colloidal Nanoparticles and Visualizing Their Self-Assembled Structures By Hoduk Cho Doctor of Philosophy in Chemistry University of California, Berkeley Professor A. Paul Alivisatos, Chair This dissertation demonstrates the application of liquid phase transmission electron microscopy for quantifying interactions between colloidal nanoparticles and visualizing their self-assembled structures in their native solution state. Over a decade ago, the first liquid cells that could successfully enclose a thin layer of liquid while maintaining compatibility with the high vacuum conditions inside an electron microscope were developed. Subsequent commercialization of this technology by several companies greatly increased its accessibility and the research field has expanded rapidly as a result. The ability to directly visualize real-time nanoscale dynamics in solution has enabled researchers in physics, chemistry, biology, and materials science to investigate previously unexplored scientific phenomena. Thus far, the vast majority of research in this field has made use of the highly perturbative effect of the electron beam to initiate the dynamic process under study. Although this approach has yielded fruitful knowledge and insights, it has not been straightforward to extrapolate the conclusions formed from these studies to experiments conducted outside of the electron microscope. The effects of electron beam irradiation are still poorly understood, and ways to counteract them are limited. A more widespread application of liquid phase transmission electron microscopy would only be realized if the influence of the electron beam were well-known and could be tuned in a predictable manner. By understanding and controlling the effects of the electron beam on the encapsulated specimen during the imaging process, it will be possible to extract information relating to the behavior of colloidal nanoparticles in solution that can be generalizable to experiments carried out in the wet lab. Chapter 1 introduces the basic concepts of nanoparticle self-assembly, interparticle interactions at the nanoscale, DNA-mediated nanoparticle assembly, liquid phase transmission electron microscopy, and radiation-induced effects that accompany electron microscopy imaging in liquid. Chapter 2 illustrates how the individual trajectories of nanoparticles moving in solution, obtained using liquid phase transmission electron microscopy, can be utilized for quantitative analysis of their interparticle interactions. Chapter 3 describes how the damaging effects of electron beam irradiation on DNA-assembled nanoparticles can be mitigated with the use of graphene and its derivatives as biocompatible radical scavengers. Chapter 4 summarizes the seminal findings that are reported in this dissertation and provides a brief outlook for the future.
Book Synopsis Nanostructure Engineering Using Electron Beam Lithography by : Paul Bernard Fischer
Download or read book Nanostructure Engineering Using Electron Beam Lithography written by Paul Bernard Fischer and published by . This book was released on 1993 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Ph. D. thesis addresses nanostructure fabrication techniques based on electron beam lithography and their application to: the creation of ultra-fast metal-semiconductor-metal photodetectors and quantum effect transistors, the investigation of light emission from silicon, and the enhancement of resolution in magnetic force microscopy. Specifically, this thesis covers the following topics. (1) The implementation and characterization of an ultra-high resolution electron beam lithography (EBL) system created by modifying a scanning electron microscope. (2) The exploration of minimum achievable feature sizes using ultra-high resolution EBL and a lift-off process with polymethyl-methacrylate resists. 10 nm features, which are among the smallest ever achieved using EBL, have been obtained using a double shadow evaporation technique, a ultra-high resolution EBL technique, and a technique utilizing EBL, reactive ion etching, and subsequent wet etching. (3) The application of ultra-high resolution EBL technology to the fabrication of ultra-fast metal-semiconductor-metal (MSM) photodetectors. The fastest response time reported to date has been achieved in this project. (4) The fabrication and characterization of modulation doped field effect transistors. Quantum effects have been observed in a point contact device. (5) The fabrication of sub-50 nm Si structures using EBL, reactive ion etching (RIE) and subsequent wet etching for the study of photoluminescence (PL) from Si. PL has been observed from an array of 20 nm diameter pillars. And finally, (6) the application of high resolution EBL to the study of magnetic materials. Single domain magnetic particles and novel MFM tips have been fabricated.
