Advanced Electron Microscopy Of Novel Ferromagnetic Materials And Ferromagnet Oxide Interfaces In Magnetic Tunnel Junctions
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Advanced Electron Microscopy Of Novel Ferromagnetic Materials And Ferromagnet Oxide Interfaces In Magnetic Tunnel Junctions
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Author :
language : en
Publisher:
Release Date : 2013
Advanced Electron Microscopy Of Novel Ferromagnetic Materials And Ferromagnet Oxide Interfaces In Magnetic Tunnel Junctions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
We have studied novel ferromagnetic (FM) materials and FM electrode/tunnel barrier interfaces in magnetic tunnel junctions (MTJs) by advanced electron microscopy including scanning transmission electron microscopy (HRSTEM) and electron energy loss spectroscopy (EELS). MTJs are one of the prototypical spintronic devices, with applications in magnetic random access memory, sensors and read heads. The performance of MTJs depends on several factors, including the FM electrodes and the FM/tunnel barrier interfaces. Therefore, to realize the high performance of MTJs, we first need high quality ferromagnetic electrodes with high spin polarization. High-quality Fe3O4 and Fe4N electrodes with theoretically predicted -100% spin polarization were fabricated by various methods and investigated by HRSTEM and STEM EELS. The Fe3O4 and Fe4N thin films have low defect density and good crystallinity, but when integrated as electrodes in a MTJ, problems emerged. In a Fe4N/AlOx/Fe MTJ, the magnetoresistance was negative, but relatively small, due to a defective Fe3O4 reaction layer formed at the Fe4N/tunnel barrier interface revealed by HRSTEM and EELS. The interfacial reaction layer was thin and discontinuous which made direct imaging difficult. Therefore, STEM EELS was used to map out the reaction layer. A Fe3O4 reaction layer was also found in a nominally symmetric CoFe/AlOx/CoFe MTJs after annealing, which also exhibited inverse TMR and a non-symmetric bias dependence. We also investigated the MTJs with the Heusler alloy Co2MnSi as one or both electrode and crystalline MgO as the tunnel barrier, which exhibit quite high TMR due to coherent tunneling. We showed that the Co2MnSi/MgO interface in these junctions is dominated by a configuration of a pure Mn plane bonded across the interface to O. This was the first observation of that interface termination. HRSTEM images also show that the fraction of MnMn/O interface termination increases with increasing Mn concentration in the CMS electrode. With the help of electron microscopy, we have found methods to increase the TMR of MTJs with half metallic materials as electrodes including Fe3O4 and Co2MnSi. We believe that the potential of half metallic materials will be realized with the development of new materials and new design of FM/tunnel barrier interfaces.
Electron Microscopy Studies Of Magnetic Tunnel Junctions
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Author : Chak Chung Andrew Yu
language : en
Publisher:
Release Date : 1999
Electron Microscopy Studies Of Magnetic Tunnel Junctions written by Chak Chung Andrew Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Ferromagnetism categories.
Advanced Electron Microscopy And Nanomaterials
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Author : Arturo Ponce
language : en
Publisher: Trans Tech Publications Ltd
Release Date : 2010-03-02
Advanced Electron Microscopy And Nanomaterials written by Arturo Ponce and has been published by Trans Tech Publications Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-03-02 with Technology & Engineering categories.
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
The American Mineralogist
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Author :
language : en
Publisher:
Release Date : 2014
The American Mineralogist written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Mineralogy categories.
Vols. 34-40 (1949-55) include Contributions to Canadian mineralogy, v. 5, pts. 1-7.
Handbook Of Spintronics
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Author : Yongbing Xu
language : en
Publisher: Springer
Release Date : 2015-10-14
Handbook Of Spintronics written by Yongbing Xu and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-14 with Science categories.
Over two volumes and 1500 pages, the Handbook of Spintronics will cover all aspects of spintronics science and technology, including fundamental physics, materials properties and processing, established and emerging device technology and applications. Comprising 60 chapters from a large international team of leading researchers across academia and industry, the Handbook provides readers with an up-to-date and comprehensive review of this dynamic field of research. The opening chapters focus on the fundamental physical principles of spintronics in metals and semiconductors, including an introduction to spin quantum computing. Materials systems are then considered, with sections on metallic thin films and multilayers, magnetic tunnelling structures, hybrids, magnetic semiconductors and molecular spintronic materials. A separate section reviews the various characterisation methods appropriate to spintronics materials, including STM, spin-polarised photoemission, x-ray diffraction techniques and spin-polarised SEM. The third part of the Handbook contains chapters on the state of the art in device technology and applications, including spin valves, GMR and MTJ devices, MRAM technology, spin transistors and spin logic devices, spin torque devices, spin pumping and spin dynamics and other topics such as spin caloritronics. Each chapter considers the challenges faced by researchers in that area and contains some indications of the direction that future work in the field is likely to take. This reference work will be an essential and long-standing resource for the spintronics community.
Magnetism And Accelerator Based Light Sources
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Author : Hervé Bulou
language : en
Publisher: Springer Nature
Release Date : 2021-02-17
Magnetism And Accelerator Based Light Sources written by Hervé Bulou and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-17 with Science categories.
This open access book collects the contributions of the seventh school on Magnetism and Synchrotron Radiation held in Mittelwihr, France, from 7 to 12 October 2018. It starts with an introduction to the physics of modern X-ray sources followed by a general overview of magnetism. Next, light / matter interaction in the X-ray range is covered with emphasis on different types of angular dependence of X-ray absorption spectroscopy and scattering. In the end, two domains where synchrotron radiation-based techniques led to new insights in condensed matter physics, namely spintronics and superconductivity, are discussed. The book is intended for advanced students and researchers to get acquaintance with the basic knowledge of X-ray light sources and to step into synchrotron-based techniques for magnetic studies in condensed matter physics or chemistry.
Oxide Electronics
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Author : Asim K. Ray
language : en
Publisher: John Wiley & Sons
Release Date : 2021-04-12
Oxide Electronics written by Asim K. Ray and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-12 with Technology & Engineering categories.
Oxide Electronics Multiple disciplines converge in this insightful exploration of complex metal oxides and their functions and properties Oxide Electronics delivers a broad and comprehensive exploration of complex metal oxides designed to meet the multidisciplinary needs of electrical and electronic engineers, physicists, and material scientists. The distinguished author eschews complex mathematics whenever possible and focuses on the physical and functional properties of metal oxides in each chapter. Each of the sixteen chapters featured within the book begins with an abstract and an introduction to the topic, clear explanations are presented with graphical illustrations and relevant equations throughout the book. Numerous supporting references are included, and each chapter is self-contained, making them perfect for use both as a reference and as study material. Readers will learn how and why the field of oxide electronics is a key area of research and exploitation in materials science, electrical engineering, and semiconductor physics. The book encompasses every application area where the functional and electronic properties of various genres of oxides are exploited. Readers will also learn from topics like: Thorough discussions of High-k gate oxide for silicon heterostructure MOSFET devices and semiconductor-dielectric interfaces An exploration of printable high-mobility transparent amorphous oxide semiconductors Treatments of graphene oxide electronics, magnetic oxides, ferroelectric oxides, and materials for spin electronics Examinations of the calcium aluminate binary compound, perovoksites for photovoltaics, and oxide 2Degs Analyses of various applications for oxide electronics, including data storage, microprocessors, biomedical devices, LCDs, photovoltaic cells, TFTs, and sensors Suitable for researchers in semiconductor technology or working in materials science, electrical engineering, and physics, Oxide Electronics will also earn a place in the libraries of private industry researchers like device engineers working on electronic applications of oxide electronics. Engineers working on photovoltaics, sensors, or consumer electronics will also benefit from this book.
Introduction To Graphene Based Nanomaterials
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Author : Luis E. F. Foa Torres
language : en
Publisher: Cambridge University Press
Release Date : 2014-01-23
Introduction To Graphene Based Nanomaterials written by Luis E. F. Foa Torres and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-01-23 with Science categories.
A detailed primer describing the most effective theoretical and computational methods and tools for simulating graphene-based systems.
Spectroscopy Of Complex Oxide Interfaces
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Author : Claudia Cancellieri
language : en
Publisher: Springer
Release Date : 2018-04-09
Spectroscopy Of Complex Oxide Interfaces written by Claudia Cancellieri and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-09 with Technology & Engineering categories.
This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1998
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Aeronautics categories.