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Spin Manipulation Using Semimagnetic Heterostructures
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Book Synopsis Spin Manipulation Using Semimagnetic Heterostructures by : Taras Slobodskyy
Download or read book Spin Manipulation Using Semimagnetic Heterostructures written by Taras Slobodskyy and published by VDM Publishing. This book was released on 2008-01 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: In pursuit of a novel generation of devices, exploration of spin properties of the particles is needed. Spintronics is a modern field in physics which exploits spin properties to be used in addition to the charge degree of freedom. Since the conductivity mismatch problem presents a fundamental obstacle for electrical spin injection from a ferromagnetic metal into a diffusive semiconductor, other means for injecting spin-polarized carriers must be used. With a tunnel contact, it is possible to achieve a highly spin-polarized room-temperature tunnel injection. Here we describe a novel approach of applying magnetic resonant tunneling diodes for spin manipulation. In this work, growth and properties of all-II-VI magnetic resonant tunneling diodes, as applied to spintronics, are reported.
Download or read book Chalcogenide written by Xinyu Liu and published by Woodhead Publishing. This book was released on 2019-11-14 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chalcogenide: From 3D to 2D and Beyond reviews graphene-like 2D chalcogenide systems that include topological insulators, interesting thermoelectric structures, and structures that exhibit a host of spin phenomena that are unique to 2D and lower-dimensional geometries. The book describes state-of-the-art materials in growth and fabrication, magnetic, electronic and optical characterization, as well as the experimental and theoretical aspects of this family of materials. Bulk chalcogenides, chalcogenide films, their heterostructures and low-dimensional chalcogenide-based quantum structures are discussed. Particular attention is paid to findings that are relevant to the continued search for new physical phenomena and new functionalities. Finally, the book covers the enormous opportunities that have emerged as it has become possible to achieve lower-dimensional chalcogenide structures by epitaxial techniques. Provides readers with foundational information on the materials growth, fabrication, magnetic, electronic and optical characterization of chalcogenide materials Discusses not only bulk chalcogenides and chalcogenide thin films, but also two-dimensional chalcogenide materials systems Reviews the most important applications in optoelectronics, photovoltaics and thermoelectrics
Book Synopsis Measurement and Manipulation of Spins and Magnetism in 2D Materials and Spinel Oxides by : Michael Jonathon Newburger
Download or read book Measurement and Manipulation of Spins and Magnetism in 2D Materials and Spinel Oxides written by Michael Jonathon Newburger and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advancements in spintronics rely on materials which exhibit stable magnetization or long-lived spin states that can be easily manipulated or probed. One class of two-dimensional (2D) materials, the monolayer transition metal dichalcogenides (TMDs) have gained significant interest due to their large spin-orbit coupling which leads to the existence of inequivalent, spin-split valleys in the band structure and predictions of long-lived spin-valley lifetimes. Furthermore, the TMDs exhibit unique optical selection rules which allow for selective control and manipulation of spin and valley polarization by helicity of light. In addition, due to their weak van der Waals coupling, these materials can be easily picked up and stacked into heterostructures with other 2D or three dimensional (3D) materials without the need to match lattice constant or growth conditions. Here, the strength of one material can surmount the weaknesses of another system, and such heterostructures have been utilized to control exciton diffusion, enhance spin/valley lifetimes, and even induce proximity spin-orbit coupling and ferromagnetism. In this thesis, we focus on measuring the spin/valley dynamics in TMD monolayers and heterostructure devices. Using time-resolved Kerr rotation (TRKR) microscopy, we observe long-lived (>5 ns) spin/valley lifetimes and a complex spatial dependence of spin/valley density in monolayer WS2 flakes. Comparisons to photoluminescence (PL) microscopy allow us to elucidate the roles that resident carriers and dark trion formation play in this spatial dependence and the stabilization of spin-valley lifetime. We extend these techniques to heterostructure devices of monolayer WSe2 and graphene where we reveal an ultrafast quenching of spin-valley signal at the WSe2/graphene heterojunctions. Complementary measurements of PL and photoconductivity demonstrate an efficient, electron dominated charge transfer into graphene, from which we conclude that the quenching of the spin-valley signal is due to charge mediated spin transfer into graphene. Additionally, we explore the growth of complementary magnetic materials by molecular beam epitaxy. Specifically, we demonstrate growth of MgAl0.5Fe1.5O4 (MAFO), a low damping, ferrimagnetic insulator which is an ideal candidate for the demonstration of proximity effects in 2D materials. We find that highly crystalline films of MAFO can be grown by MBE and utilize alternating layer epitaxy to alter the distribution of Fe in the crystal lattice, from which we observe a significant change in the saturation magnetic moment.
Book Synopsis Introduction to Spintronics by : Supriyo Bandyopadhyay
Download or read book Introduction to Spintronics written by Supriyo Bandyopadhyay and published by CRC Press. This book was released on 2015-09-18 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Spintronics provides an accessible, organized, and progressive presentation of the quantum mechanical concept of spin and the technology of using it to store, process, and communicate information. Fully updated and expanded to 18 chapters, this Second Edition:Reflects the explosion of study in spin-related physics, addressing seven
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.
Book Synopsis Quantum Waveguide in Microcircuits by : Jian-Bai Xia
Download or read book Quantum Waveguide in Microcircuits written by Jian-Bai Xia and published by CRC Press. This book was released on 2017-12-01 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Moore's Law predicts that the degree of microprocessor integration of circuits would double every 18 months in DRAM. Although the scaling of microelectronic circuit elements still follows Moore's Law, the unit density of power consumption becomes unacceptable. Therefore, on one hand, people develop continuously the microelectronic technology. On the other, people consider the developing road after Moore's rule is broken. This book introduces theories and experiments of quantum transport and intends to provide foundations of semiconductor micro- and nano electronics for after the Moore age.
Book Synopsis Nonequilibrium Carrier Dynamics in Semiconductors by : Marco Saraniti
Download or read book Nonequilibrium Carrier Dynamics in Semiconductors written by Marco Saraniti and published by Springer Science & Business Media. This book was released on 2007-12-14 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nonequilibrium Carrier Dynamics in Semiconductors" is a well-established, specialist conference, held every two years, covering a range of topics of current interest to R&D in semiconductor physics/materials, optoelectronics, nanotechnology, quantum information processing. Papers accepted for publication are selected and peer-reviewed by members of the Program Committee during the conference to ensure both rapid and high-quality processing.
Book Synopsis Electronic and Spin Dependent Phenomena in Two-dimensional Materials and Heterostructures by : Jinsong Xu (Ph. D. in physics)
Download or read book Electronic and Spin Dependent Phenomena in Two-dimensional Materials and Heterostructures written by Jinsong Xu (Ph. D. in physics) and published by . This book was released on 2018 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene has remarkable opportunities for spintronics due to its high mobility and long spin diffusion length, especially when encapsulated in hexagonal boron nitride (h-BN). Beyond the three basic processes of spin injection, spin transport, and spin detection, it is crucial to explore new methods of spin manipulation in order to develop novel architectures for spin-based logic. In the first chapter of this thesis, I briefly introduce the field of spintronics and graphene related research. In the second chapter, I present the spin diffusion model used in this thesis to analyze spin transport in graphene and heterostructures spintronics. In the third chapter, I present my work on gate-tunable spin transport in h-BN encapsulated graphene-based spin valves with one-dimensional ferromagnetic contacts. The non-local spin signal can be tuned by gate voltage and even change polarity. The gate-controlled spin polarity via magnetic proximity effect may overcome the usual need for an applied magnetic field and a magnetization reversal to implement the graphene-based spin logic. Beyond magnetic proximity effect, another route for graphene spintronics is to combine with other two-dimensional (2D) materials, such as transition metal dichalcogenide (TMDC). In the fourth chapter, I demonstrate spin injection from monolayer MoS2 to few-layer graphene following optical valley/spin exciation in MoS2 with circularly polarized light up to room temperature. The magnitude and direction of spin polarization is controlled by both helicity and photon energy. These results demonstrate a 2D spintronic/valleytronic system that achieves optical spin injection and lateral spin transport at room temperature in a single device, which paves the way for multifunctional 2D spintronic devices for memory and logic applications. While graphene/TMDC heterostructures hold great promise for the electrical and optical control of spins in graphene, the observed spin lifetimes in these heterostructures are short (
Book Synopsis Manipulation of Spin Transport Phenomena in Structurally, Magnetically and Topographically Modified Ferromagnetic/non-magnetic Heterostructures by : Sascha Keller
Download or read book Manipulation of Spin Transport Phenomena in Structurally, Magnetically and Topographically Modified Ferromagnetic/non-magnetic Heterostructures written by Sascha Keller and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis II-VI Compounds and Semimagnetic Semiconductors by : J. B. Mullin
Download or read book II-VI Compounds and Semimagnetic Semiconductors written by J. B. Mullin and published by . This book was released on 1995 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main emphasis of this volume is on the fundamental physics of the II-VI compounds focusing on the properties of epitaxial layers, heterostructures, multilayers and superlattices. The main topics are: doping of wide gap II-VI compounds, quantum wires and quantum dots, exitonic gain, as well as basic processes in lasers, including the microgun laser. New aspects covered are dephasing phenomena.
Book Synopsis Spin-orbit Coupling Effects in LaTiO3/SrTiO3 Heterostructures by : Michael John Veit
Download or read book Spin-orbit Coupling Effects in LaTiO3/SrTiO3 Heterostructures written by Michael John Veit and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The manipulation of the spin degrees of freedom in a solid has been of fundamental and technological interest recently for developing high-speed, low-power computation devices. There has been much work focused on developing materials which can manipulate spins when incorporated into so-called spintronic devices. In particular, complex oxides have shown to be a promising class of materials for study because of the ease of interfacing materials with vastly different properties. I have been studying the interface between the Mott insulator LaTiO3 and the band insulator SrTiO3 for such applications. To date, this system has been exceptionally understudied compared to other oxide-based systems which show emergent metallicity. In this dissertation, I focus on the measurement of spin-orbit coupling effects in this system. For ultrathin (3-4 unit cells) LaTiO3 thin films on SrTiO3, I observe a variety of effects which make it the ideal system for future study and implementation in spintronics devices. Specifically, I observe a giant Rashba-type spin splitting and the first-ever observation of the quantum spin Hall effect (QSHE) in an oxide system. There is a promising strategy to achieve spin splitting using spatial symmetry breaking without the use of a magnetic field, known as Rashba-type splitting, which can be used to electrically manipulate spins. Here I report evidence for a giant Rashba-type splitting at the interface of LaTiO3 and SrTiO3. Analysis of the magnetotransport reveals anisotropic magnetoresistance, weak anti-localization and quantum oscillation behavior consistent with a large Rashba-type splitting. In addition, the angular dependence of the quantum oscillations indicates that the Fermi surface is three-dimensional. It is surprising to find a large Rashba-type splitting in 3d transition metal oxide-based systems such as the LaTiO3/SrTiO3 interface but is promising for the manipulation of spin in oxide-based spintronics. The most remarkable result I present here is the observation of the QSHE at a Mott insulator/band insulator oxide interface where dissipation-less transport occurs in helical edge states. The QSHE is a manifestation of a two-dimensional topological insulator state which has previously been limited to low temperatures and submicron length scales. Here I show that the first observation of the QSHE upon electrically gating a full oxide system that holds up to exceptionally long length scales and nearly room-temperature. This includes quantized resistance that is dimension independent, nonlocal transport, and a large magnetoresistance. These results lay the foundation for using the QSHE in practical oxide-based spintronics devices. Finally, a proof-of-concept experiment is done to show that this system can indeed be interfaced with a ferromagnet for spintronics applications. The ferromagnet is used to pump spins into the LaTiO3/SrTiO3 heterostructure, and it is shown that spin scattering is greater at the interface between LaTiO3 and SrTiO3 compared to the bulk of the LaTiO3. This demonstrates that spins can be efficiently pumped into the interface and spin-orbit coupling is enhanced at the interface allowing for the manipulation of the spins. Altogether, my results show that the LaTiO3/SrTiO3 heterostructure is an exciting avenue for future study. The unexpectedly large spin-orbit coupling in this system provides new avenues for manipulating spintronics devices. The appearance of the near room temperature QSHE alone makes it possible to integrate this phase in practical devices for the first time.
Book Synopsis Spin and Charge Transport in 2D Materials and Magnetic Insulator/metal Heterostructures by : Walid Amamou
Download or read book Spin and Charge Transport in 2D Materials and Magnetic Insulator/metal Heterostructures written by Walid Amamou and published by . This book was released on 2017 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Furthermore, we examine spin manipulation in a nonmagnetic Pt using an internal magnetic exchange field produced by the adjacent magnetic insulator CoFe2O4 grown by MBE. Here, we report the observation of a strong magnetic proximity effect of Pt deposited on top of a perpendicular magnetic anisotropy (PMA) inverse spinel material Cobalt Ferrite (CFO, CoFe 2O4). The CFO was grown by MBE and its magnetization was characterized by Vibrating Sample Magnetometry (VSM) demonstrating the strong out of plane magnetic anisotropy of this material. The anomalous Hall measurement on a Pt/CFO Hall bar exhibits a strong non-linear background around the saturation of the out of plane CFO magnetization. After subtraction of the Ordinary Hall Effect (OHE), we extract a strongly hysteretic anomalous Hall voltage that indicates that Pt acquired the magnetization properties of the CFO and has become ferromagnetic due to the proximity effects.
Book Synopsis Semiconductor Spintronics by : Thomas Schäpers
Download or read book Semiconductor Spintronics written by Thomas Schäpers and published by De Gruyter Textbook. This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the first comprehensive introduction into the rapidly evolving field of spintronics, this textbook covers ferromagnetism in nano-electrodes, spin injection, spin manipulation, and the practical use of these effects in next-generation electronics. Based on foundations in quantum mechanics and solid state physics this textbook guides the reader to the forefront of research and development in the field, based on repeated lectures given by the author. From the content: Low-dimensional semiconductor structures Magnetism in solids Diluted magnetic semiconductors Magnetic electrodes Spin injection Spin transistor Spin interference Spin Hall effect Quantum spin Hall effect Topological insulators Quantum computation with electron spins
Book Synopsis Quantum Spin Transport and Collective Magnetic Dynamics in Heterostructures by : Scott Andrew Bender
Download or read book Quantum Spin Transport and Collective Magnetic Dynamics in Heterostructures written by Scott Andrew Bender and published by . This book was released on 2014 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis advances the theory of quantum and semiclassical transport in magnetic heterostructures. In the solid state, angular momentum can be carried by individual electrons and collective modes. The flow of angular momentum (a spin current), central to the operation of spintronic devices, is generated by the application of electric and magnetic fields and temperature gradients. In what follows, we explore the physics of such nonequilibrium spin currents in magnetic structures, involving an interplay of charge and magnetic dynamics and thermoelectric effects. Chapter 1 provides an introduction to the transport of spin in magnets, carried by electrons and collective excitations of the magnetic order. Chapters 2-6 study the role of thermal fluctuations in transport and magnetic dynamics. In Chapter 2, we describe how incoherent thermal fluctuations of the spin density (magnons), which open inelastic scattering channels, contribute to spin and energy transport between a normal metal and a magnet. Such (temperature-dependent) transport may arise from a thermal gradient applied across the metal/magnet interface or a spin accumulation inside the normal metal and may alter or even drive magnetic dynamics. Chapter 3, is dedicated to the realization of Bose-Einstein condensed magnons (previously observed by microwave pumping) in a normal metal/insulating ferromagnet heterostructure. As is described in Chapter 2, the combination of a temperature gradient and normal metal spin accumulation can drive spin into the insulating ferromagnet, accumulating as magnons; upon reaching a critical density, the magnons, which are bosonic, spontaneously form a quasi-equilibrium condensate. Chapter 4 focuses on thermally driven spin-torques in electrically insulating structures, wherein direct electric control of magnetic dynamics is prohibited. In contrast to the interfacial transport described in Chapter 2, where a spin accumulation is to necessary to observe magnetic dynamics, here we demonstrate how spin-torques can arise from a pure thermal gradient in a heterostructure. These spin-torques can be measured by ferromagnetic resonance and can, under a sufficiently strong bias, actuate magnetic switching. Chapter 5 concerns charge transport in a single-electron transistor, consisting of a magnetic quantum dot in contact with magnetic and normal metal leads. Microwave-driven precession by the dot induces a pumped electric current, which can be enhanced and made highly nonlinear by electron interactions (Coulomb blockade). The dependence of the resulting electrical response on the power and spectrum of microwave irradiation may be utilized to develop nanoscale microwave detectors analogous to single-electron transistor-based electrostatic sensors and nanoelectromechanical devices. In Chapter 6 we study bilayers, composed of a nonmagnetic conducting and a magnetic layer. We develop a general phenomenology for the magnetic and charge dynamics, which are coupled by spin-orbit interactions. In contrast to Chapters 2-4, we focus on the long-wavelength magnetic dynamics, which is subject to current-induced torques and produces fictitious electromotive forces that drive charge dynamics.}
Book Synopsis Spin Effects in High- and Low-field Magnetotransport Experiments in Semimagnetic Cd1-xMnxTe Heterostructures by : Christian Betthausen
Download or read book Spin Effects in High- and Low-field Magnetotransport Experiments in Semimagnetic Cd1-xMnxTe Heterostructures written by Christian Betthausen and published by . This book was released on 2012 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 2016-04-19 with total page 797 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 Grunberg's Nobel Prize-winning discovery of giant magnetoresistance (GMR) in magnetic metallic multilayers. Handbook of Spin Transport and Magnetism provides a comprehensive, bal
Book Synopsis Optical Detection and Manipulation of Single Electron Spin Coherence in a Semiconductor Quantum Dot by : Maiken Sophia Høgh Mikkelsen
Download or read book Optical Detection and Manipulation of Single Electron Spin Coherence in a Semiconductor Quantum Dot written by Maiken Sophia Høgh Mikkelsen and published by . This book was released on 2009 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: As an alternative system for single spin control, few Mn-ion spins in a GaAs quantum well were measured using polarized photoluminescence. A new mechanism for optically addressing and controlling small numbers of magnetic ions in semiconductors is demonstrated without the need for magnetic fields or magnetic materials. The polarized Mn-spins precess in a transverse magnetic field enabling Hanle measurements of the spin lifetimes. The observed Mn-ion spin lifetimes reach promising timescales in the low doping limit, demonstrating that individual magnetic spins in a solid are useful systems for coherent manipulation of spin information.
