Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Injection De Spins Dans Les Semi Conducteurs
Download Injection De Spins Dans Les Semi Conducteurs full books in PDF, epub, and Kindle. Read online Injection De Spins Dans Les Semi Conducteurs ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Injection de spins dans les semi-conducteurs by : Louis Grenet
Download or read book Injection de spins dans les semi-conducteurs written by Louis Grenet and published by . This book was released on 2010 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'injection de courant polarisé en spin dans les semi-conducteurs est un point-clef de la spintronique, discipline qui vise à utiliser le spin de l'électron comme degré de liberté en électronique. Ce travail de thèse étudie l'injection de spins depuis une électrode ferromagnétique à travers une barrière tunnel vers un semi-conducteur en absence de champ magnétique. La polarisation du courant injecté est détectée optiquement, ce qui impose que l'aimantation des électrodes soit perpendiculaire aux plans des électrodes. Ce travail s'articule donc en deux parties. La première section traite de l'élaboration d'hétérostructures oxyde/métal ferromagnétiques pour l'injection de spins dans le GaAs et le Si. Les croissances d'électrodes de MgO/FePt par épitaxie par jets moléculaires sur GaAs et de Al2O3/CoPt par pulvérisation cathodique sur Si sont décrites. L'étude des propriétés structurales et magnétiques et de transport de ces couches a ainsi permis de montrer la possibilité d'obtenir des films minces à aimantation perpendiculaire pour l'injection de spins sur plusieurs matériaux. La deuxième partie se focalise sur le transport polarisé en spin dans le Silicium. L'injection de courant polarisé dans ce matériau en absence de champ magnétique externe est ainsi démontrée pour la première fois par des mesures d'électroluminescence. L'analyse de la lumière émise par un puits quantique de SiGe inséré dans une diode de Silicium montre une polarisation optique de l'ordre de 3% liée à la polarisation en spin du courant injecté.
Book Synopsis Etude de l'injection et détection de spin dans le silicium et germanium by : Fabien Rortais
Download or read book Etude de l'injection et détection de spin dans le silicium et germanium written by Fabien Rortais and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Depuis la découverte de la magnétorésistance (MR) géante en 1988 par le groupe d'Albert Fert (prix Nobel de physique en 2007), le domaine de l'électronique de spin a connu un essor sans précédent, justifié par toutes les applications qu'elle permet d'envisager en électronique.Depuis une vingtaine d'années, il est question d'utiliser le degré de liberté de spin directement dans les matériaux semi-conducteurs avec le gros avantage par rapport aux métaux de pouvoir manipuler électriquement le spin des porteurs. L'électronique de spin dans les matériaux semi-conducteurs utilise pour coder l'information non seulement la charge des porteurs (électrons et trous), mais aussi leur spin. En associant charge et spin, on ajoute de nouvelles fonctionnalités aux dispositifs de micro-électronique traditionnels.Le premier challenge consiste à contrôler l'injection et la détection d'une population de porteurs polarisés en spin dans les semi-conducteurs traditionnels (Si, Ge).Pour cela, nous avons étudié des dispositifs hybrides de type MIS: Métal ferromagnétique/Isolant/Semi-conducteur qui nous permettent d'injecter et de détecter électriquement un courant de spin. La première partie de cette thèse concerne les dispositifs à 3 terminaux sur différents substrats qui utilisent une unique électrode ferromagnétique pour injecter et détecter par effet Hanle l'accumulation de spin dans les semi-conducteurs. Une amplification des signaux de spin extraits expérimentalement par rapport aux valeurs théoriques du modèle diffusif est à l'origine d'une controverse importante. Nous avons alors démontré que l'origine du signal de MR ou de l'amplification ne peut être expliquée par la présence de défauts dans la barrière tunnel. A l'inverse, nous prouvons la présence d'états d'interface qui peuvent expliquer l'amplification du signal de spin. De plus, la réduction de la densité d'états d'interface par une préparation de surface montre des changements significatifs comme la diminution du signal de spin.La deuxième partie de ces travaux concerne la transition vers les vannes de spin latérales sur semi-conducteurs. Dans ces dispositifs utilisant deux électrodes FM, le découplage entre l'injection et la détection de spin permet de s'affranchir des effets de magnétorésistance parasites car seul un pur courant de spin est détecté dans le semi-conducteur. Par une croissance d'une jonction tunnel ferromagnétique épitaxiée, nous avons démontré l'injection de spin dans des substrats de silicium et germanium sur isolant. En particulier nous observons un fort signal de spin jusqu'à température ambiante dans le germanium.Finalement, les prémices de la manipulation de spin par l'étude du couplage spin-orbite ont été étudiées dans les substrats d'arséniure de gallium et de germanium. En effet, nous avons induit par effet Hall de spin (une conséquence du couplage spin-orbite) une accumulation de spin qui a été sondée en utilisant la spectroscopie de muon. On démontre alors, à basse température, la présence de l'accumulation grâce au couplage entre les spins électroniques accumulés et les noyaux de l'arséniure de gallium.
Book Synopsis Spin Injection and Transport in Magnetoelectronics by : P. Vincenzini
Download or read book Spin Injection and Transport in Magnetoelectronics written by P. Vincenzini and published by Trans Tech Publications Ltd. This book was released on 2006-10-01 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection presents 19 papers. Altogether, the collection offers a wealth of up-to-date information on Spin Injection and Transport in Magnetoelectronics.
Book Synopsis Phénomène d’injection de spin dans un semiconducteur à partir d’un contact ferromagnétique by : Michaël Tran
Download or read book Phénomène d’injection de spin dans un semiconducteur à partir d’un contact ferromagnétique written by Michaël Tran and published by . This book was released on 2009 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse de doctorat s’inscrit dans le cadre très large de l’intersection entre les domaines de l’électronique de spin (spintronique) et le monde des semiconducteurs. La première partie traite de l’injection et la détection de courants polarisés en spin dans un semiconducteur en géométrie latérale (type MOS). Après avoir explicité de manière théorique les conditions favorables à l’injection et la détection de courants polarisés en spin dans un semiconducteur, cette problématique est illustrée par des expériences impliquant un détecteur optique (Spin-Led) puis électrique. Les expériences de transport sont réalisées sur des électrodes Co/Al2/O3/GaAs. Par mesure d’effet Hanle électrique, une accumulation de spin « géante » est mise en évidence. Nous développons alors un modèle de transport tunnel séquentiel à travers des états localisés qui permet d’expliquer l’amplitude des effets mesurés. La deuxième partie est consacrée à l’étude du semiconducteur magnétique dilué (DMS) (Ga,Mn)As. Ce matériau, dont l’origine du ferromagnétisme est très différente des métaux de transition, offre une alternative d’intégration d’un matériau ferromagnétique dans des hétérostructures semiconductrices. Nous montrons comment il est possible de mesurer de la TAMR (magnétorésistance anisotrope tunnel) sur des structures résonantes avec une résolution en tension très fine. Un effet de décalage des résonances en fonction de la direction de l’aimantation est mise en évidence. Nous montrons qu’avec une modélisation du problème par le modèle de Dietl, il est possible de relier le décalage des résonances à la présence d’une contrainte épitaxiale de la couche de (Ga,Mn)As.
Book Synopsis World Scientific Reference On Spin In Organics (In 4 Volumes) by : Zeev Valy Vardeny
Download or read book World Scientific Reference On Spin In Organics (In 4 Volumes) written by Zeev Valy Vardeny and published by World Scientific. This book was released on 2017-12-27 with total page 1364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference work on Spin in Organics contains four volumes dedicated to spin injection, spin transport, spin pumping, organic magnetic field effect, and molecular spintronics. The field of Organic Spintronics has accelerated and matured in the last dozen years with the realization of an organic spin-valve (in 2004) and magneto-resistance and magneto-electroluminescence in organic optoelectronic devices (2006).The book series is comprehensive in that it summarizes all aspects of Organic Spintronics to date. The first two volumes deal with spin injection, spin transport, spin manipulation and spin pumping into organic semiconductors. The main device that is thoroughly discussed here is the organic spin-valve, where spinterface states at the interface between the organic semiconductor and the ferromagnetic (FM) electrode has been the focus of many chapters. An interesting emerging subject is the role of chirality in the organic layer of the device. A relatively new method of achieving spin aligned carriers in organic semiconductors is spin pumping, where magnons in the FM substrate generate spin aligned carriers in the organic layer at the FM/organic interface.The third volume deals mainly with magnetic field effect in organic devices. Several spin-mixture processes that lead to magnetic field effect in devices and films are thoroughly discussed, such as hyperfine interaction, direct spin-orbit coupling, indirect spin-orbit coupling via Δg, triplet-triplet annihilation, and thermal spin alignment. The similarity between the magnetic field effect obtained in optoelectronic devices based on organic semiconductors and the novel hybrid organic-inorganic semiconductors is also a subject of intense interest. The fourth volume deals with spin in molecular films and devices. It includes thorough discussion of spin exchange interaction that leads to organic ferromagnets, as well as manifestation of various spin interactions in thin molecular films and devices.
Book Synopsis Semiconductor Spintronics by : Jianbai Xia
Download or read book Semiconductor Spintronics written by Jianbai Xia and published by World Scientific. This book was released on 2012 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor Spintronics, as an emerging research discipline and an important advanced field in physics, has developed quickly and obtained fruitful results in recent decades. This volume is the first monograph summarizing the physical foundation and the experimental results obtained in this field. With the culmination of the authors'' extensive working experiences, this book presents the developing history of semiconductor spintronics, its basic concepts and theories, experimental results, and the prospected future development. This unique book intends to provide a systematic and modern foundation for semiconductor spintronics aimed at researchers, professors, post-doctorates, and graduate students, and to help them master the overall knowledge of spintronics.a
Book Synopsis CMOSET 2013 Vol. 4: Nanoelectronics and Spintronics Track by : CMOS Emerging Technologies Research
Download or read book CMOSET 2013 Vol. 4: Nanoelectronics and Spintronics Track written by CMOS Emerging Technologies Research and published by CMOS Emerging Technologies. This book was released on 2014-06-23 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presentation slides for the 2013 CMOS Emerging Technologies Research conference in Whistler, Canada.
Book Synopsis Micromagnetism and Electrical Resistance of Ferromagnetic Electrodes for Spin Injection Devices by :
Download or read book Micromagnetism and Electrical Resistance of Ferromagnetic Electrodes for Spin Injection Devices written by and published by Cuvillier Verlag. This book was released on 2004 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spin Current written by Sadamichi Maekawa and published by Oxford University Press. This book was released on 2017 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Semiconductor Spintronics by : Thomas Schäpers
Download or read book Semiconductor Spintronics written by Thomas Schäpers and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-05-10 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised and expanded edition of the first comprehensive introduction to the rapidly-evolving field of spintronics covers ferromagnetism in nano-electrodes, spin injection, spin manipulation, and the practical use of these effects in next-generation electronics. Moreover, the book now also includes spin-based optics, topological materials and insulators, and the quantum spin Hall effect.
Book Synopsis Semiconductor Spintronics and Quantum Computation by : D.D. Awschalom
Download or read book Semiconductor Spintronics and Quantum Computation written by D.D. Awschalom and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past few decades of research and development in solid-state semicon ductor physics and electronics have witnessed a rapid growth in the drive to exploit quantum mechanics in the design and function of semiconductor devices. This has been fueled for instance by the remarkable advances in our ability to fabricate nanostructures such as quantum wells, quantum wires and quantum dots. Despite this contemporary focus on semiconductor "quantum devices," a principal quantum mechanical aspect of the electron - its spin has it accounts for an added quan largely been ignored (except in as much as tum mechanical degeneracy). In recent years, however, a new paradigm of electronics based on the spin degree of freedom of the electron has begun to emerge. This field of semiconductor "spintronics" (spin transport electron ics or spin-based electronics) places electron spin rather than charge at the very center of interest. The underlying basis for this new electronics is the intimate connection between the charge and spin degrees of freedom of the electron via the Pauli principle. A crucial implication of this relationship is that spin effects can often be accessed through the orbital properties of the electron in the solid state. Examples for this are optical measurements of the spin state based on the Faraday effect and spin-dependent transport measure ments such as giant magneto-resistance (GMR). In this manner, information can be encoded in not only the electron's charge but also in its spin state, i. e.
Book Synopsis Concepts in Spin Electronics by : Sadamichi Maekawa
Download or read book Concepts in Spin Electronics written by Sadamichi Maekawa and published by Oxford University Press, USA. This book was released on 2006-01-26 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, a new branch of physics and nanotechnology called The aim of this book is tod, which aims at simultaneously present new directions in the development of spin electronics in both the basic physics and the technologywhich will become the foundation of future electronics.ich will become the foundation of future electronics.
Book Synopsis Spin Electronics by : David D. Awschalom
Download or read book Spin Electronics written by David D. Awschalom and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of scientific research and technological development is replete with examples of breakthroughs that have advanced the frontiers of knowledge, but seldom does it record events that constitute paradigm shifts in broad areas of intellectual pursuit. One notable exception, however, is that of spin electronics (also called spintronics, magnetoelectronics or magnetronics), wherein information is carried by electron spin in addition to, or in place of, electron charge. It is now well established in scientific and engineering communities that Moore's Law, having been an excellent predictor of integrated circuit density and computer performance since the 1970s, now faces great challenges as the scale of electronic devices has been reduced to the level where quantum effects become significant factors in device operation. Electron spin is one such effect that offers the opportunity to continue the gains predicted by Moore's Law, by taking advantage of the confluence of magnetics and semiconductor electronics in the newly emerging discipline of spin electronics. From a fundamental viewpoine, spin-polarization transport in a material occurs when there is an imbalance of spin populations at the Fermi energy. In ferromagnetic metals this imbalance results from a shift in the energy states available to spin-up and spin-down electrons. In practical applications, a ferromagnetic metal may be used as a source of spin-polarized electronics to be injected into a semiconductor, a superconductor or a normal metal, or to tunnel through an insulating barrier.
Book Synopsis Spin Physics in Semiconductors by : Mikhail I. Dyakonov
Download or read book Spin Physics in Semiconductors written by Mikhail I. Dyakonov and published by Springer. This book was released on 2017-10-04 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers an extensive introduction to the extremely rich and intriguing field of spin-related phenomena in semiconductors. In this second edition, all chapters have been updated to include the latest experimental and theoretical research. Furthermore, it covers the entire field: bulk semiconductors, two-dimensional semiconductor structures, quantum dots, optical and electric effects, spin-related effects, electron-nuclei spin interactions, Spin Hall effect, spin torques, etc. Thanks to its self-contained style, the book is ideally suited for graduate students and researchers new to the field.
Book Synopsis Spintronics Handbook, Second Edition: Spin Transport and Magnetism by : Evgeny Y. Tsymbal
Download or read book Spintronics Handbook, Second Edition: Spin Transport and Magnetism written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2019-05-20 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications.
Book Synopsis Contemporary Topics In Spintronics by : Supriyo Bandyopadhyay
Download or read book Contemporary Topics In Spintronics written by Supriyo Bandyopadhyay and published by World Scientific. This book was released on 2017-02-02 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: The success of spintronics — the science and technology of storing, processing, sensing and communicating information using the quantum mechanical spin degree of freedom of an electron — is critically dependent on the ability to inject, detect and manipulate spins in semiconductors either by incorporating ferromagnetic materials into device architectures or by using external magnetic and electric fields. In spintronics, the controlled generation and manipulation of spin polarization in nonmagnetic semiconductors is required for the design of spin-sensitive devices ranging from spin-qubit hosts, quantum memory and gates, quantum teleporters, spin polarizers and filters, spin-field-effect-transistors, and spin-splitters, among others. One of the major challenges of spintronics is to control the creation, manipulation, and detection of spin polarized currents by purely electrical means. Another challenge is to preserve spin coherence in a device for the longest time or over the longest distance in order to produce reliable spintronic processors. These challenges remain daunting, but some progress has been made recently in overcoming some of the steepest obstacles. This book covers some of the recent advances in the field of spintronics using semiconductors.
Download or read book Spintronics written by Tomasz Blachowicz and published by Walter de Gruyter GmbH & Co KG. This book was released on 2019-05-06 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: The De Gruyter series Graduate Texts in Condensed Matter (GTCM) covers all aspects of Condensed Matter Physics as e.g.: Low Temperature Physics Dynamics and Statistical Physics Semiconductor Physics Metal and Material Physics Surface Science Magnetism for Graduate Students and Researchers. Series Editor: Professor Dr. Christian Enss, Managing Director of the Kirchhoff Institute for Physics, Ruprecht-Karls-University, Heidelberg/Germany.
