Download or read book Spin Dynamics in Magnetic Thin Films and Spintronics Devices written by Yunpeng Chen and published by . This book was released on 2016 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic materials are the essential parts of advanced magnetic recording and microwave devices. All the applications require the control of the magnetization orientation that is studied as magnetic dynamics. In a magnetic recording device, such as hard disk drive (HDD), the digital information is stored as the magnetization direction of magnetic domains. To rewrite the information, one needs to reverse the magnetization. With the increase of areal density, the magnetic anisotropy is enhanced to overcome the thermal fluctuations. Consequently, the magnetic switching becomes more difficult. Microwave assisted magnetization reversal (MAMR) is developed to lower the switching field by exciting large angle precession of magnetization. Damping constant, as a parameter describing the dissipation of magnetic materials, plays a critical role in MAMR. In this thesis, I theoretically and experimentally study the damping dependence of MAMR in micro-size magnetic dots. Based on the study, MAMR is more efficient when the damping of the magnetic dot is small. Magnetic random access memory (MRAM) based on magnetic tunnel junctions (MTJs) is a novel magnetic recording device that has the potential to replace HDD due to its fast read/write rate. Moreover, to keep increasing the recording density, the magnetic media with perpendicular magnetic anisotropy (PMA) replaced the in-plane magnetic recording media. In this work, the magnetic thin films such as Co/Pd multilayers and Ta/CoFeB/MgO were fabricated to be with PMA. Based on the PMA thin films, the MTJs were developed with optimized deposition conditions and post-annealing. We observed above 60% TMR in Ta/CoFeB/MgO/CoFeB based perpendicular junctions. The voltage controlled magnetic anisotropy (VCMA) was demonstrated in those MTJs, which is an efficient technique to control the magnetization via an electric field. The spin transfer torques were also characterized in Ta/CoFeB/MgO structures with PMA. The microwave response is another useful property of magnetic materials. The ferromagnetic resonance (FMR) of typical ferromagnetic materials like Fe, Co, Ni and their alloys are in the gigahertz range. Therefore, the magnetic thin films have been widely utilized in microwave devices such as bandpass filters, insulators, and oscillators. Conventionally, electromagnets generate a magnetic field to control the resonance frequency, which is bulky, noisy, slow and energy consuming. By realizing the huge effective field due to exchange interaction, a novel scheme was demonstrated to shift the resonance frequency of the optical mode in magnetic bilayers with interlayer exchange interaction. A maximum 20 GHz tunable range was achieved in a spin-valve base spintronics microwave device in the experiment. A dynamic tuning of the resonance frequency as high as 9 GHz was demonstrated via temperature controlled exchange interaction.

Download or read book Spin Dynamics and Damping in Ferromagnetic Thin Films and Nanostructures written by Anjan Barman and published by Springer. This book was released on 2017-12-27 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the latest developments in the field of spin dynamics and magnetic damping. It discusses the various ways to tune damping, specifically, dynamic and static control in a ferromagnetic layer/heavy metal layer. In addition, it addresses all optical detection techniques for the investigation of modulation of damping, for example, the time-resolved magneto-optical Kerr effect technique.

Download or read book Handbook of Spintronics written by Yongbing Xu and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spintronics written by Puja Dey and published by Springer Nature. This book was released on 2021-04-13 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the overview of Spintronics, including What is Spintronics ?; Why Do We Need Spintronics ?; Comparative merit-demerit of Spintronics and Electronics ; Research Efforts put on Spintronics ; Quantum Mechanics of Spin; Dynamics of magnetic moments : Landau-Lifshitz-Gilbert Equation; Spin-Dependent Band Gap in Ferromagnetic Materials; Functionality of ‘Spin’ in Spintronics; Different Branches of Spintronics etc. Some important notions on basic elements of Spintronics are discussed here, such as – Spin Polarization, Spin Filter Effect, Spin Generation and Injection, Spin Accumulation, Different kinds of Spin Relaxation Phenomena, Spin Valve, Spin Extraction, Spin Hall Effect, Spin Seebeck Effect, Spin Current Measurement Mechanism, Magnetoresistance and its different kinds etc. Concept of Giant Magnetoresistance (GMR), different types of GMR, qualitative and quantitative explanation of GMR employing Resistor Network Theory are presented here. Tunnelling Magnetoresistance (TMR), Magnetic Junctions, Effect of various parameters on TMR, Measurement of spin relaxation length and time in the spacer layer are covered here. This book highlights the concept of Spin Transfer Torque (STT), STT in Ferromagnetic Layer Structures, STT driven Magnetization Dynamics, STT in Magnetic Multilayer Nanopillar etc. This book also sheds light on Magnetic Domain Wall (MDW) Motion, Ratchet Effect in MDW motion, MDW motion velocity measurements, Current-driven MDW motion, etc. The book deals with the emerging field of spintronics, i.e., Opto-spintronics. Special emphasis is given on ultrafast optical controlling of magnetic states of antiferromagnet, Spin-photon interaction, Faraday Effect, Inverse Faraday Effect and outline of different all-optical spintronic switching. One more promising branch i.e., Terahertz Spintronics is also covered. Principle of operation of spintronic terahertz emitter, choice of materials, terahertz writing of an antiferromagnetic magnetic memory device is discussed. Brief introduction of Semiconductor spintronics is presented that includes dilute magnetic semiconductor, feromagnetic semiconductor, spin polarized semiconductor devices, three terminal spintronic devices, Spin transistor, Spin-LED, and Spin-Laser. This book also emphasizes on several modern spintronics devices that includes GMR Read Head of Modern Hard Disk Drive, MRAM, Position Sensor, Biosensor, Magnetic Field sensor, Three Terminal Magnetic Memory Devices, Spin FET, Race Track Memory and Quantum Computing.

Download or read book Spin Dynamics in Confined Magnetic Structures II written by Burkard Hillebrands and published by Springer Science & Business Media. This book was released on 2003-09-04 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second volume of the book on spin dynamics in confined magnetic structures covers central aspects of spin dynamic phenomena, so that researchers can find a comprehensive compilation of the current work in the field. Introductory chapters help newcomers to understand the basic concepts, and the more advanced chapters give the current state of the art for most spin dynamic issues in the milliseconds to femtoseconds range. Both experimental techniques and theoretical work are discussed. The comprehensive presentation of these developments makes this volume very timely and valuable for every researcher working in the field of magnetism. It describes the new experimental techniques which have advanced this field very rapidly. Among the techniques covered, particular attention is given to those involving high temporal, elemental and spatial resolution as well as to techniques involving magnetic field pulses with very short rise times and durations.

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 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting from quantum mechanical and condensed matter foundations, this book introduces into the necessary theory behind spin electronics (Spintronics). Equations of spin diffusion, -evolution and -tunelling are provided before an overview is given of simulation of spin transport at the atomic scale. Furthermore, applications are discussed with a focus on elementary spintronics devices such as spin valves, memory cells and hard disk heads.

Download or read book Nanomagnetism and Spintronics written by Teruya Shinjo and published by Elsevier. This book was released on 2013-10-07 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concise and accessible chapters of Nanomagnetism and Spintronics, Second Edition, cover the most recent research in areas of spin-current generation, spin-calorimetric effect, voltage effects on magnetic properties, spin-injection phenomena, giant magnetoresistance (GMR), and tunnel magnetoresistance (TMR). Spintronics is a cutting-edge area in the field of magnetism that studies the interplay of magnetism and transport phenomena, demonstrating how electrons not only have charge but also spin. This second edition provides the background to understand this novel physical phenomenon and focuses on the most recent developments and research relating to spintronics. This exciting new edition is an essential resource for graduate students, researchers, and professionals in industry who want to understand the concepts of spintronics, and keep up with recent research, all in one volume. Provides a concise, thorough evaluation of current research Surveys the important findings up to 2012 Examines the future of devices and the importance of spin current

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.

Download or read book Imaging and Control of Magnetization Dynamics for Spintronic Devices written by Daniel Birt and published by . This book was released on 2013 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: As features on integrated circuits continue to shrink, currently at 22 nm and predicted to approach 10 nm by 2020, the semiconductor industry is rapidly brushing up against the fundamental limits of electric charge and current based devices. These limits are due to the fact that charges are being pushed around in tiny areas and they repel one another with significant force. Fortunately, there are many other degrees of freedom in solids that do not suffer from these limitations and are just waiting to be harnessed in useful devices. This idea is behind all of the fields that have lately been proliferating ending in -onics, photonics, plasmonics, phononics, and of most relevance to this dissertation spintronics. Spintronics refers to a field of research wherein ways are sought to utilize the spin property of the electron in devices. One of the most attractive aspects of electron spin is that it can be used to store (transiently or permanently), process, and transmit information. The main challenge in spintronics is accessing the spin degree of freedom. Until the discovery of the giant magnetoresistance effect in the late 1980's, the only way to manipulate the electron spin was through a magnetic field. Recent developments have shown that electron spins can be controlled with direct currents of both heat and electrons, which have the benefit of being easy to generate and direct without interfering over a large area. The purpose of this dissertation is to study methods of controlling the dynamics of magnetization in thin films for spintronic applications by imaging the spin wave intensity in devices. To this end we have constructed a micro-focus Brillouin Light Scattering system to map the intensity of spin waves propagating in thin ferromagnetic films on the sub-micron scale. We have studied issues relating to fundamental issues of spin wave propagation in thin films. We have investigated the possibility of spin wave amplification with direct charge currents and spin currents generated by the spin Hall effect. Furthermore, we have demonstrated the ability to measure the magnon and phonon temperatures, which is important for studies of thermal transport.

Download or read book Magnetic Nanostructures in Modern Technology written by Bruno Azzerboni and published by Springer Science & Business Media. This book was released on 2007-10-22 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, a team of outstanding scientists in the field of modern magnetic nanotechnologies illustrates the state-of-the-art in several areas of advanced magneto-electronic devices, magnetic micro-electromechanical systems and high density information storage technologies. Providing a unique source of information for the young physicist, chemist or engineer, the book also serves as a crucial reference for the expert scientist and the teacher of advanced university courses.

Download or read book Magnetic Memory Technology written by Denny D. Tang and published by John Wiley & Sons. This book was released on 2021-01-07 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: STAY UP TO DATE ON THE STATE OF MRAM TECHNOLOGY AND ITS APPLICATIONS WITH THIS COMPREHENSIVE RESOURCE Magnetic Memory Technology: Spin-Transfer-Torque MRAM and Beyond delivers a combination of foundational and advanced treatments of the subjects necessary for students and professionals to fully understand MRAM and other non-volatile memories, like PCM, and ReRAM. The authors offer readers a thorough introduction to the fundamentals of magnetism and electron spin, as well as a comprehensive analysis of the physics of magnetic tunnel junction (MTJ) devices as it relates to memory applications. This book explores MRAM's unique ability to provide memory without requiring the atoms inside the device to move when switching states. The resulting power savings and reliability are what give MRAM its extraordinary potential. The authors describe the current state of academic research in MRAM technology, which focuses on the reduction of the amount of energy needed to reorient magnetization. Among other topics, readers will benefit from the book's discussions of: An introduction to basic electromagnetism, including the fundamentals of magnetic force and other concepts An thorough description of magnetism and magnetic materials, including the classification and properties of magnetic thin film properties and their material preparation and characterization A comprehensive description of Giant magnetoresistance (GMR) and tunneling magnetoresistance (TMR) devices and their equivalent electrical model Spin current and spin dynamics, including the properties of spin current, the Ordinary Hall Effect, the Anomalous Hall Effect, and the spin Hall effect Different categories of magnetic random-access memory, including field-write mode MRAM, Spin-Torque-Transfer (STT) MRAM, Spin-Orbit Torque (SOT) MRAM, and others Perfect for senior undergraduate and graduate students studying electrical engineering, similar programs, or courses on topics like spintronics, Magnetic Memory Technology: Spin-Transfer-Torque MRAM and Beyond also belongs on the bookshelves of engineers and other professionals involved in the design, development, and manufacture of MRAM technologies.

Download or read book Hung pi y an written by and published by . This book was released on 1935 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultrathin Magnetic Structures III written by J.A.C. Bland and published by Springer Science & Business Media. This book was released on 2004-12-13 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to understand and control the unique properties of interfaces has created an entirely new field of magnetism which already has a profound impact in technology and is providing the basis for a revolution in electronics. The last decade has seen dramatic progress in the development of magnetic devices for information technology but also in the basic understanding of the physics of magnetic nanostructures. This volume describes thin film magnetic properties and methods for characterising thin film structure topics that underpin the present 'spintronics' revolution in which devices are based on combined magnetic materials and semiconductors. Volume IV deals with the fundamentals of spintronics: magnetoelectronic materials, spin injection and detection, micromagnetics and the development of magnetic random access memory based on GMR and tunnel junction devices. Together these books provide readers with a comprehensive account of an exciting and rapidly developing field. The treatment is designed to be accessible both to newcomers and to experts already working in this field who would like to get a better understanding of this very diversified area of research.

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.

Download or read book Metallic Spintronic Devices written by Xiaobin Wang and published by CRC Press. This book was released on 2017-12-19 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic Spintronic Devices provides a balanced view of the present state of the art of metallic spintronic devices, addressing both mainstream and emerging applications from magnetic tunneling junction sensors and spin torque oscillators to spin torque memory and logic. Featuring contributions from well-known and respected industrial and academic experts, this cutting-edge work not only presents the latest research and developments but also: Describes spintronic applications in current and future magnetic recording devices Discusses spin-transfer torque magnetoresistive random-access memory (STT-MRAM) device architectures and modeling Explores prospects of STT-MRAM scaling, such as detailed multilevel cell structure analysis Investigates spintronic device write and read optimization in light of spintronic memristive effects Considers spintronic research directions based on yttrium iron garnet thin films, including spin pumping, magnetic proximity, spin hall, and spin Seebeck effects Proposes unique solutions for low-power spintronic device applications where memory is closely integrated with logic Metallic Spintronic Devices aims to equip anyone who is serious about metallic spintronic devices with up-to-date design, modeling, and processing knowledge. It can be used either by an expert in the field or a graduate student in course curriculum.

Download or read book Spin Dynamics in Confined Magnetic Structures I written by Burkard Hillebrands and published by Springer Science & Business Media. This book was released on 2001-11-06 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory chapters help newcomers to understand the basic concepts, and the more advanced chapters give the current state of the art for most spin dynamic issues in the milliseconds to femtoseconds range. Emphasis is placed on both the discussion of the experimental techniques and on the theoretical work. The comprehensive presentation of these developments makes this volume very timely and valuable for every researcher working in the field of magnetism.

Download or read book Spintronic 2D Materials written by Wenqing Liu and published by Woodhead Publishing. This book was released on 2019-11-28 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spintronic 2D Materials: Fundamentals and Applications provides an overview of the fundamental theory of 2D electronic systems that includes a selection of the most intensively investigated 2D materials. The book tells the story of 2D spintronics in a systematic and comprehensive way, providing the growing community of spintronics researchers with a key reference. Part One addresses the fundamental theoretical aspects of 2D materials and spin transport, while Parts Two through Four explore 2D material systems, including graphene, topological insulators, and transition metal dichalcogenides. Each section discusses properties, key issues and recent developments. In addition, the material growth method (from lab to mass production), device fabrication and characterization techniques are included throughout the book. Discusses the fundamentals and applications of spintronics of 2D materials, such as graphene, topological insulators and transition metal dichalcogenides Includes an in-depth look at each materials system, from material growth, device fabrication and characterization techniques Presents the latest solutions on key challenges, such as the spin lifetime of 2D materials, spin-injection efficiency, the potential proximity effects, and much more