Spin Dependent Transport Phenomena In Organic Semiconductors

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Spin-dependent Transport Phenomena in Organic Semiconductors

Author : Jeremy D. Bergeson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Spin-dependent Transport Phenomena in Organic Semiconductors by : Jeremy D. Bergeson

Download or read book Spin-dependent Transport Phenomena in Organic Semiconductors written by Jeremy D. Bergeson and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Thin-film organic semiconductor transport can have an anomalously high sensitivity to low magnetic fields. Such a response is unexpected considering that at a modest magnetic field of 100 Oe the ratio of thermal energy to the energy associated with the intrinsic spin of charge carriers is 104 at room temperature and 102 at liquid helium temperatures. Nevertheless, we report experimental characterization of (1) spin-dependent injection, detection and transport through organic semiconductors and (2) the influence of a magnetic field on the spin dynamics of recombination-limited transport. The first focus of this work is accomplished by fabricating basic spin-valve devices consisting of two magnetic layers spatially separated by a nonmagnetic organic semiconductor. The spin-valve effect is a change in electrical resistance due to the magnetizations of the magnetic layers changing from parallel to antiparallel alignment, or vice versa. Metallic and semiconductor conductivities differ by many orders of magnitude inhibiting spin injection from the magnet into the nonmagnet, however, we achieve a 20% spin-valve effect at cryogenic temperatures by inserting ultra-thin tunnel barriers at the metal/semiconductor interfaces. In a unique device we replace one metallic magnet with the organic-based magnetic semiconductor vanadium tetracyanoethylene (V[TCNE]2) and attain a spin-valve effect at 10 K. The second focus of this work is the bulk magnetoresistance (MR) of thin-film small molecule, oligomer and polymer organic semiconductor structures. At room temperature the resistance can change significantly (up to 8% at 100 Oe, 15% at 1000 Oe.) Depending on parameters such as temperature, layer thickness, or voltage, the resistance of these materials may increase or decrease as a function of field. A model, termed magnetoresistance by the interconversion of singlets and triplets (MIST), is developed to account for this anomalous behavior. The MIST mechanism predicts that increasing the spin-orbit coupling in the organic semiconductor should decrease the magnitude of the MR. In an experiment where the small molecule Alq3 is doped with strong spin-orbit coupling molecules the MR decreases by an order of magnitude or more, depending on the doping. In addition, we show the experimental observation of high-field MR in devices with and without magnetic contacts.

Theoretical Studies of Spin Dependent Transport Phenomena

Author : Christoph Michel
Publisher : Cuvillier Verlag
ISBN 13 : 3867274851
Total Pages : 205 pages
Book Rating : 4.8/5 (672 download)

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Book Synopsis Theoretical Studies of Spin Dependent Transport Phenomena by : Christoph Michel

Download or read book Theoretical Studies of Spin Dependent Transport Phenomena written by Christoph Michel and published by Cuvillier Verlag. This book was released on 2007 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:

World Scientific Reference On Spin In Organics (In 4 Volumes)

Author : Zeev Valy Vardeny
Publisher : World Scientific
ISBN 13 : 9813230169
Total Pages : 1364 pages
Book Rating : 4.8/5 (132 download)

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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.

Organic Spintronics

Author : Zeev Valy Vardeny
Publisher : CRC Press
ISBN 13 : 1439806578
Total Pages : 354 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis Organic Spintronics by : Zeev Valy Vardeny

Download or read book Organic Spintronics written by Zeev Valy Vardeny and published by CRC Press. This book was released on 2010-04-09 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Major development efforts in organic materials research has grown for an array of applications. Organic spintronics, in particular, has flourished in the area of organic magneto-transport. Reflecting the main avenues of advancement in this arena, this volume explores spin injection and manipulation in organic spin valves, the magnetic field effect in organic light-emitting diodes (OLEDs), the spin transport effect in relation to spin manipulation, organic magnets as spin injection electrodes in organic spintronics devices, the coherent control of spins in organic devices using the technique of electronically detected magnetic resonance, and the possibility of using organic spin valves as sensors.

Handbook of Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 1439803773
Total Pages : 809 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis Handbook of Spin Transport and Magnetism by : Evgeny Y. Tsymbal

Download or read book Handbook of Spin Transport and Magnetism written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2011-08-25 with total page 809 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past several decades, the research on spin transport and magnetism has led to remarkable scientific and technological breakthroughs, including Albert Fert and Peter Grünberg’s Nobel Prize-winning discovery of giant magnetoresistance (GMR) in magnetic metallic multilayers. Handbook of Spin Transport and Magnetism provides a comprehensive, balanced account of the state of the art in the field known as spin electronics or spintronics. It reveals how key phenomena first discovered in one class of materials, such as spin injection in metals, have been revisited decades later in other materials systems, including silicon, organic semiconductors, carbon nanotubes, graphene, and carefully engineered nanostructures. The first section of the book offers a historical and personal perspective of the field written by Nobel Prize laureate Albert Fert. The second section addresses physical phenomena, such as GMR, in hybrid structures of ferromagnetic and normal metals. The third section discusses recent developments in spin-dependent tunneling, including magnetic tunnel junctions with ferroelectric barriers. In the fourth section, the contributors look at how to control spin and magnetism in semiconductors. In the fifth section, they examine phenomena typically found in nanostructures made from metals, superconductors, molecular magnets, carbon nanotubes, quantum dots, and graphene. The final section covers novel spin-based applications, including advanced magnetic sensors, nonvolatile magnetoresistive random access memory, and semiconductor spin-lasers. The techniques and materials of spintronics have rapidly evolved in recent years, leading to vast improvements in hard drive storage and magnetic sensing. With extensive cross-references between chapters, this seminal handbook provides a complete guide to spin transport and magnetism across various classes of materials and structures.

Spintronics Handbook

Author : Evgeny Y. Tsymbal
Publisher :
ISBN 13 : 9781498769723
Total Pages : 0 pages
Book Rating : 4.7/5 (697 download)

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Book Synopsis Spintronics Handbook by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook written by Evgeny Y. Tsymbal and published by . This book was released on 2019 with total page 0 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.

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 0429784376
Total Pages : 530 pages
Book Rating : 4.4/5 (297 download)

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Book Synopsis Spintronics Handbook, Second Edition: Spin Transport and Magnetism by : Evgeny Y. Tsymbal

Spin Physics in Semiconductors

Author : Mikhail I. Dyakonov
Publisher : Springer
ISBN 13 : 3319654365
Total Pages : 546 pages
Book Rating : 4.3/5 (196 download)

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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.

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 042980525X
Total Pages : 555 pages
Book Rating : 4.4/5 (298 download)

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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 2019-06-26 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spintronics Handbook, 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. Features: Presents the most comprehensive reference text for the overlapping fields of spintronics (spin transport) and magnetism. Covers the full spectrum of materials and structures, from silicon and organic semiconductors to carbon nanotubes, graphene, and engineered nanostructures. Extends coverage of two-dimensional materials beyond graphene, including molybdenum disulfide and study of their spin relaxation mechanisms Includes new dedicated chapters on cutting-edge topics such as spin-orbit torques, topological insulators, half metals, complex oxide materials and skyrmions. Discusses important emerging areas of spintronics with superconductors, spin-wave spintronics, benchmarking of spintronics devices, and theory and experimental approaches to molecular spintronics. Evgeny Tsymbal's research is focused on computational materials science aiming at the understanding of fundamental properties of advanced ferromagnetic and ferroelectric nanostructures and materials relevant to nanoelectronics and spintronics. He is a George Holmes University Distinguished Professor at the Department of Physics and Astronomy of the University of Nebraska-Lincoln (UNL), Director of the UNL’s Materials Research Science and Engineering Center (MRSEC), and Director of the multi-institutional Center for NanoFerroic Devices (CNFD). Igor Žutić received his Ph.D. in theoretical physics at the University of Minnesota. His work spans a range of topics from high-temperature superconductors and ferromagnetism that can get stronger as the temperature is increased, to prediction of various spin-based devices. He is a recipient of 2006 National Science Foundation CAREER Award, 2005 National Research Council/American Society for Engineering Education Postdoctoral Research Award, and the National Research Council Fellowship (2003-2005). His research is supported by the National Science Foundation, the Office of Naval Research, the Department of Energy, and the Airforce Office of Scientific Research.

Physics of Organic Semiconductors

Author : Wolfgang Brütting
Publisher : John Wiley & Sons
ISBN 13 : 3527654968
Total Pages : 660 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Physics of Organic Semiconductors by : Wolfgang Brütting

Download or read book Physics of Organic Semiconductors written by Wolfgang Brütting and published by John Wiley & Sons. This book was released on 2012-10-02 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of organic electronics has seen a steady growth over the last 15 years. At the same time, our scientific understanding of how to achieve optimum device performance has grown, and this book gives an overview of our present-day knowledge of the physics behind organic semiconductor devices. Based on the very successful first edition, the editors have invited top scientists from the US, Japan, and Europe to include the developments from recent years, covering such fundamental issues as: - growth and characterization of thin films of organic semiconductors, - charge transport and photophysical properties of the materials as well as their electronic structure at interfaces, and - analysis and modeling of devices like organic light-emitting diodes or organic lasers. The result is an overview of the field for both readers with basic knowledge and for an application-oriented audience. It thus bridges the gap between textbook knowledge largely based on crystalline molecular solids and those books focusing more on device applications.

Spin-dependent Transport Phenomena in Single and Coupled Quantum Point Contacts

Author : Alexandros Shailos
Publisher :
ISBN 13 :
Total Pages : 222 pages
Book Rating : 4.:/5 (612 download)

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Book Synopsis Spin-dependent Transport Phenomena in Single and Coupled Quantum Point Contacts by : Alexandros Shailos

Download or read book Spin-dependent Transport Phenomena in Single and Coupled Quantum Point Contacts written by Alexandros Shailos and published by . This book was released on 2004 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher :
ISBN 13 : 9780367777876
Total Pages : 0 pages
Book Rating : 4.7/5 (778 download)

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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 . This book was released on 2021-03-31 with total page 0 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.

Electrical Detection of Spin-Dependent Transport in Silicon

Author : Cheuk Chi Lo
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (957 download)

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Book Synopsis Electrical Detection of Spin-Dependent Transport in Silicon by : Cheuk Chi Lo

Download or read book Electrical Detection of Spin-Dependent Transport in Silicon written by Cheuk Chi Lo and published by . This book was released on 2011 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information, be it classical or quantum mechanical, requires representation in physical reality for processing and storage. Conventional classical computation utilizes the charge degree of freedom of carriers in semiconductors for encoding information; however, fundamental physical limitations will be reached within the next two decades preventing further improvements in computational capacity with charged-based devices. In recent years, the utilization of the spin states of charged carriers has shown remarkable promise for both enhancing the functionalities of classical computation devices and achieving quantum information processing. In this work, I explore this spin degree of freedom in donor-doped silicon metal-oxide-semiconductor (MOS) devices, which are promising architectures for the implementation of spin-based qubits in silicon for quantum information processing. The spin-dependent transport phenomena in such systems are studied systemically by electrically detected magnetic resonance (EDMR) techniques at X-band ($\approx9.5\:$GHz) and W-band ($\approx95\:$GHz), with corresponding Zeeman fields of $0.35\:$T and $3.5\:$T, respectively. It is found that direct spin-dependent scattering amongst conduction electrons and neutral donors gives rise to a much weaker contribution to spin-dependent transport than previously reported. Instead, the dominant spin-dependent processes in these systems are due to the polarization-dependent conduction electron mobility and subsequent polarization transfer from donor electrons. The technique of EDMR also allows us to perform {\it in situ} electron polarization detection, which is used to demonstrate spin drift and spin diffusion effects in silicon MOSFET devices. Towards the realization of donor spin-state readout, few-donor doped finFETs are also developed and the transport spectroscopy of such devices explored. These measurements provide invaluable insight into these interesting quantum devices and pave the way for the realization of spin-based computation.

Spin Injection and Manipulation in Organic Semiconductors

Author : Karthik Raman Venkataraman
Publisher :
ISBN 13 :
Total Pages : 155 pages
Book Rating : 4.:/5 (777 download)

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Book Synopsis Spin Injection and Manipulation in Organic Semiconductors by : Karthik Raman Venkataraman

Download or read book Spin Injection and Manipulation in Organic Semiconductors written by Karthik Raman Venkataraman and published by . This book was released on 2011 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of organic semiconductors to enable organic spintronic devices requires the understanding of transport and control of the spin state of the carriers. This thesis deals with the above issue, focusing on the interface between the organic semiconductor and the spin source. The morphology of the organic molecule at the interface is shown to play a dominant role in this study, influencing spin injection. The interface molecule morphology affects the form of interaction between the organic molecule and the ferromagnet. This interaction ranges from a weak Van der Waals' to a chemical interaction leading to charge transfer, hybridization and other interface chemistry. As a result, the spin-dependent density of states is modified, influencing the spin injection process. The first part of the thesis focuses on identifying the interface properties between the ferromagnet and the organic semiconductor, rubrene. This is performed in a vertical organic junction geometry using different interface characterization tools. The growth morphology of the rubrene molecule is shown to influence the electronic coupling between the molecule and the ferromagnet. This has a pronounced effect on the spin injection efficiency and the magnetoresistance signals in the devices. The complex nature of the top interface is dealt with in detail. These studies provide insights on the importance of tailoring the interface properties to control and realize optimum behavior. As an alternative to conventional ferromagnets, a spin-filter material, europium sulphide, is demonstrated as a spin-polarized source. Spin-filter materials have shown the possibility to inject spin-polarized electrons into the organic semiconductor at higher voltage bias. This knowledge encouraged to seek organic spin-filter materials. Understanding the importance of molecule morphology from the work on rubrene, the second part of the thesis involved the study on a new class of organic materials called the phenalenyl compounds. Study using the compound, Zinc methyl phenalenyl, was initiated that showed large magnetoresistance signals of 50% at 4.2 K to 20% at close to room temperature. The origin of this magnetoresistance is attributed to a new interface phenomena described by the spin-filtering effect. The interface molecule morphology is found to play a very important role at the interface inducing an antiferromagnetic state and dominating the device physics. This technique opens up a new approach to engineer the interface and realize new functional devices without worrying about the bulk disorder of the organic film. This thesis thus shows the feasibility of tuning the property of the interface using tailor-made molecules to realize new functional devices at room temperature that can lead to development of the field and technological applications.

Spintronics Handbook Second Edition

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 9780367779702
Total Pages : 0 pages
Book Rating : 4.7/5 (797 download)

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Book Synopsis Spintronics Handbook Second Edition by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook Second Edition written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2021-03-31 with total page 0 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.

Molecular Spintronics

Author : Marta Galbiati
Publisher : Springer
ISBN 13 : 3319226118
Total Pages : 191 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Molecular Spintronics by : Marta Galbiati

Download or read book Molecular Spintronics written by Marta Galbiati and published by Springer. This book was released on 2015-10-15 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis targets molecular or organic spintronics and more particularly the spin polarization tailoring opportunities that arise from the ferromagnetic metal/molecule hybridization at interfaces: the new concept of spinterface. Molecular or organic spintronics is an emerging research field at the frontier between organic chemistry and spintronics. The manuscript is divided into three parts, the first of which introduces the basic concepts of spintronics and advantages that molecules can bring to this field. The state of the art on organic and molecular spintronics is also presented, with a special emphasis on the physics and experimental evidence for spinterfaces. The book’s second and third parts are dedicated to the two main experimental topics investigated in the thesis: Self-Assembled Monolayers (SAMs) and Organic Semiconductors (OSCs). The study of SAMs-based magnetic tunnel nanojunctions reveals the potential to modulate the properties of such devices “at will,” since each part of the molecule can be tuned independently like a “LEGO” building block. The study of Alq3-based spin valves reveals magnetoresistance effects at room temperature and is aimed at understanding the respective roles played by the two interfaces. Through the development of these systems, we demonstrate their potential for spintronics and provide a solid foundation for spin polarization engineering at the molecular level.

First-principles Investigation of Puzzling Spin-dependent Transport Phenomena in Molecular and Nanostructured Systems

Author : Martin Sebastian Zöllner
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis First-principles Investigation of Puzzling Spin-dependent Transport Phenomena in Molecular and Nanostructured Systems by : Martin Sebastian Zöllner

Download or read book First-principles Investigation of Puzzling Spin-dependent Transport Phenomena in Molecular and Nanostructured Systems written by Martin Sebastian Zöllner and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: