Transmission Electron Microscopy Characterisation For Development Of Cofeb Mgo Based Magnetic Tunnel Junctions
DOWNLOAD
Download Transmission Electron Microscopy Characterisation For Development Of Cofeb Mgo Based Magnetic Tunnel Junctions PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Transmission Electron Microscopy Characterisation For Development Of Cofeb Mgo Based Magnetic Tunnel Junctions book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Transmission Electron Microscopy Characterisation For Development Of Cofeb Mgo Based Magnetic Tunnel Junctions
DOWNLOAD
Author : Viyada Harnchana
language : en
Publisher:
Release Date : 2011
Transmission Electron Microscopy Characterisation For Development Of Cofeb Mgo Based Magnetic Tunnel Junctions written by Viyada Harnchana and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Film Deposition And Microfabrication Of Magnetic Tunnel Junctions With An Mgo Barrier
DOWNLOAD
Author : Yuqing Du
language : en
Publisher:
Release Date : 2012
Film Deposition And Microfabrication Of Magnetic Tunnel Junctions With An Mgo Barrier written by Yuqing Du and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Magnetic tunnel junctions (MTJs), which consist of a thin insulation layer sandwiched by two ferromagnetic (FM) layers, are among the key devices of spintronics that have promising technological applications for computer hard disk drives, magnetic random access memory (MRAM) and other future spintronic devices. The work presented here is related to the development of relevant techniques for the preparation and characterization of magnetic films, exchanged biased systems and MTJs. The fabrication and characterization of PtMn/CoFe exchange biased systems and MTJs with Al-O barriers were undertaken when the new Aviza StratIon fxP ion beam deposition tool was developed by the project consortium funded by DTI MNT. After the Nordiko 9550 spintronic deposition tool was installed at Plymouth, the work focused on the development of MTJ multilayer stacks with layer structures of CoFeB/MgO/CoFe/IrMn and IrMn/CoFeB/MgO/CoFeB to achieve coherent tunneling with a crystalline MgO barrier. The film deposition, microfabrication, magnetic field annealing, microstructural and nano-scale characterization, magnetic and magneto-transport measurement for these devices have been systematically studied to achieve smooth interfaces and desired crystallographic textures and magnetic properties of layer stacks. Magnetoresistance (MR) of up to 200% was obtained from MTJs with a layer structure of Ta/CuN/Ta/CoFeB/MgO/CoFe/IrMn/Ta and a CuN bottom electrode. Enhanced exchange anisotropy from the bottom pinned IrMn/CoFeB stacks has been obtained, which demonstrated the possibility of fabricating MTJs with CoFeB as both the top and bottom FM electrodes with strong exchange bias. The origin of the enhanced exchange bias field was studied by employing high resolution transmission electron microscopy (HRTEM) and x-ray magnetic circular dichroism (XMCD) to examine the mmicrostructure properties and element specific magnetic properties of the stacks. Results demonstrate that the enhanced exchange anisotropy in the IrMn/CoFeB system is closely associated with the increased uncompensated interfacial spins. MTJs with layered structures of IrMn/CoFeB/MgO/CoFeB were prepared based on this exchange bias system. However, further work is required for the optimisation of the (001) crystallographic textures of the CoFeB/MgO/CoFeB stack to achieve coherent tunneling.
Engineering And Characterization Of Alox Based Magnetic Tunnel Junctions
DOWNLOAD
Author : Chengxiang Ji
language : en
Publisher:
Release Date : 2008
Engineering And Characterization Of Alox Based Magnetic Tunnel Junctions written by Chengxiang Ji and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Advanced Electron Microscopy Of Novel Ferromagnetic Materials And Ferromagnet Oxide Interfaces In Magnetic Tunnel Junctions
DOWNLOAD
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.
Handbook Of Spintronics
DOWNLOAD
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
DOWNLOAD
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.
Spintronics Based Computing
DOWNLOAD
Author : Weisheng Zhao
language : en
Publisher: Springer
Release Date : 2015-05-11
Spintronics Based Computing written by Weisheng Zhao and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-11 with Technology & Engineering categories.
This book provides a comprehensive introduction to spintronics-based computing for the next generation of ultra-low power/highly reliable logic. It will cover aspects from device to system-level, including magnetic memory cells, device modeling, hybrid circuit structure, design methodology, CAD tools, and technological integration methods. This book is accessible to a variety of readers and little or no background in magnetism and spin electronics are required to understand its content. The multidisciplinary team of expert authors from circuits, devices, computer architecture, CAD and system design reveal to readers the potential of spintronics nanodevices to reduce power consumption, improve reliability and enable new functionality.
Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2008
Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Dissertations, Academic categories.
Heusler Alloys
DOWNLOAD
Author : Claudia Felser
language : en
Publisher: Springer
Release Date : 2015-11-12
Heusler Alloys written by Claudia Felser and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-12 with Technology & Engineering categories.
This book gives an overview of the physics of Heusler compounds ranging from fundamental properties of these alloys to their applications. Especially Heusler compounds as half-metallic ferromagnetic and topological insulators are important in condensed matter science due to their potential in magnetism and as materials for energy conversion. The book is written by world-leaders in this field. It offers an ideal reference to researchers at any level.
Spin Current
DOWNLOAD
Author : Sadamichi Maekawa
language : en
Publisher: Oxford University Press
Release Date : 2017
Spin Current written by Sadamichi Maekawa and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Science categories.
In a new branch of physics and technology, called spin-electronics or spintronics, the flow of electrical charge (usual current) as well as the flow of electron spin, the so-called "spin current", are manipulated and controlled together. This book is intended to provide an introduction and guide to the new physics and applications of spin current.