Magnetic Skyrmions In In Plane Magnets Stability Current Induced Dynamics And Excitations

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Magnetic Skyrmions in In-plane Magnets: Stability, Current-induced Dynamics and Excitations

Author : Venkata Krishna Bharadwaj
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Magnetic Skyrmions in In-plane Magnets: Stability, Current-induced Dynamics and Excitations by : Venkata Krishna Bharadwaj

Download or read book Magnetic Skyrmions in In-plane Magnets: Stability, Current-induced Dynamics and Excitations written by Venkata Krishna Bharadwaj and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The invention of transistors and microchips has revolutionized information storage. Technological progress has led to the miniaturization of microelectronics, resulting in higher energy consumption and heat production, which presents difficulties for microprocessor manufacturers. Therefore, there is a need for new computing and information technology approaches. Spintronics, which utilizes both electron spin and charge, shows great promise in overcoming the limitations of semiconductor technology and enhancing data storage capabilities. It offers increased functionality to devices and addresses current data storage constraints. An encouraging prospect among these options is the use of domain walls in racetrack memory device, enabling efficient and speedy storage of data in a non-volatile manner. Nonetheless, they encounter challenges such as the pinning of domain walls at the edges and the need for a high current density to relocate them. Skyrmionics, a new protagonist in the field of spintronics, has recently gained significant attention. Magnetic skyrmions, nanoscale windings of the spin configuration in certain magnetic materials, exhibit nontrivial topology and have the potential to replace domain walls in racetrack memories. Room-temperature observations have fueled research into skyrmion-like quasiparticles, showing lower current-driven motion (compared to domain walls) mediated by both spin-transfer and spin-orbit torques. This offers potential for racetrack memory devices, where skyrmions encode the units of information. However, the topological nature of ferromagnetic skyrmions leads to the skyrmion Hall effect, which pushes them towards the racetrack's edge, thereby causing data loss. Efficient skyrmion-based spintronic memories require the suppression of the skyrmion Hall effect and, in turn, to explore other topological spin textures. Recent studies have indicated the presence of skyrmion analogues known as in-plane skyrmions or bimerons in chiral magnet thin films with in-plane anisotropy. This thesis focuses on investigating these in-plane skyrmions in thin-film in-plane magnets. A minimal in-plane micromagnetic model is considered to assess their stability, followed by analyzing the symmetries of the Dzyaloshinskii-Moriya interaction and suggesting potential materials to host in-plane skyrmions. Furthermore, we investigate the stability of in-plane skyrmions in the monoclinic system with mirror symmetry. The thesis also explores two methods for generating in-plane skyrmions: creating magnetic bubbles through geometric constriction and releasing skyrmions from magnetic inhomogeneities. Additionally, a proof-of-concept for a racetrack utilizing in-plane skyrmions is presented. Lastly, the thesis examines the current-driven motion of in-plane skyrmions, highlighting the advantages they offer compared to Néel skyrmions through Thiele analysis and micromagnetic simulations.

Magnetic Skyrmions and Their Applications

Author : Giovanni Finocchio
Publisher : Woodhead Publishing
ISBN 13 : 012820933X
Total Pages : 472 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Magnetic Skyrmions and Their Applications by : Giovanni Finocchio

Download or read book Magnetic Skyrmions and Their Applications written by Giovanni Finocchio and published by Woodhead Publishing. This book was released on 2021-06-03 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic skyrmions are particle-like objects described by localized solutions of non-linear partial differential equations. Up until a few decades ago, it was believed that magnetic skyrmions only existed in condensed matter as short-term excitations that would quickly collapse into linear singularities. The contrary was proven theoretically in 1989 and evidentially in 2009. It is now known that skyrmions can exist as long-living metastable configurations in low-symmetry condensed matter systems with broken mirror symmetry, increasing the potential applications possible. Magnetic Skyrmions and their Applications delves into the fundamental principles and most recent research and developments surrounding these unique magnetic particles. Despite achievements in the synthesis of systems stabilizing chiral magnetic skyrmions and the variety of experimental investigations and numerical calculations, there have not been many summaries of the fundamental physical principles governing magnetic skyrmions or integrating those concepts with methods of detection, characterization and potential applications. Magnetic Skyrmions and their Applications delivers a coherent, state-of-the-art discussion on the current knowledge and potential applications of magnetic skyrmions in magnetic materials and device applications. First the book reviews key concepts such as topology, magnetism and materials for magnetic skyrmions. Then, charactization methods, physical mechanisms, and emerging applications are discussed. - Covers background knowledge and details the basic principles of magnetic skyrmions, including materials, characterization, statics and dynamics - Reviews materials for skyrmion stabilization including bulk materials and interface-dominated multilayer materials - Describes both well-known and unconventional applications of magnetic skyrmions, such as memristors and reservoir computing

Magnetic Multilayers

Author : Lawrence H Bennett
Publisher : World Scientific
ISBN 13 : 9814571067
Total Pages : 397 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Magnetic Multilayers by : Lawrence H Bennett

Download or read book Magnetic Multilayers written by Lawrence H Bennett and published by World Scientific. This book was released on 1994-12-16 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on an increasingly important area of materials science and technology, namely, the fabrication and properties of artificial materials where slabs of magnetized materials are sandwiched between slabs of nonmagnetized materials. It includes reviews by experts on the theory and descriptions of the various experimental techniques such as those using nuclear or electron spin probes, as well as optical, X-ray or neutron probes. It also reviews potential applications such as the giant magnetoresistance, and one specialized preparation technique, the electrodeposition. The various chapters are tutorial in nature, making the subject accessible to nonspecialists, as well as useful to researchers in the field.

Magnetic Skyrmions

Author : Dipti Ranjan Sahu
Publisher : BoD – Books on Demand
ISBN 13 : 1839692529
Total Pages : 150 pages
Book Rating : 4.8/5 (396 download)

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Book Synopsis Magnetic Skyrmions by : Dipti Ranjan Sahu

Download or read book Magnetic Skyrmions written by Dipti Ranjan Sahu and published by BoD – Books on Demand. This book was released on 2021-07-28 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic skyrmionics is an advanced and active research field, which involves fundamental physics, the creation of efficient next-generation high-density information devices, the formation and manipulation of nanometer-size skyrmions in devices, and the development of compatible materials at room temperature. The magnetic skyrmions found in magnetic materials exhibit spiral magnetism. This book presents a basic overview of magnetic skyrmions along with current research on magnetic skyrmions, emphasizing formation mechanisms and materials design strategies. This book is suitable for an interdisciplinary audience of undergraduates, graduates, engineers, scientists, and researchers in the development of the next generation of spintronic devices.

Spin Current

Author : Sadamichi Maekawa
Publisher : Oxford University Press
ISBN 13 : 0198787073
Total Pages : 541 pages
Book Rating : 4.1/5 (987 download)

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Book Synopsis Spin Current by : Sadamichi Maekawa

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.

Chiral Solitons

Author : Keh-fei Liu
Publisher : World Scientific
ISBN 13 : 9814507806
Total Pages : 580 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Chiral Solitons by : Keh-fei Liu

Download or read book Chiral Solitons written by Keh-fei Liu and published by World Scientific. This book was released on 1987-04-01 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review volume on topological and nontopological chiral solitons presents a global view on the current developments of this field in particle and nuclear physics. The book addresses problems in quantization, restoration of translational and rotational symmetry, and the field theoretical approach to solitons which are common problems in the field of solitons. Primarily aimed for graduate students and the novice in the field, the collected articless cover a broad spectrum of topics in formalism as well as phenomenology.

Topology in Magnetism

Author : Jiadong Zang
Publisher : Springer
ISBN 13 : 3319973347
Total Pages : 426 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Topology in Magnetism by : Jiadong Zang

Download or read book Topology in Magnetism written by Jiadong Zang and published by Springer. This book was released on 2018-09-24 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents both experimental and theoretical aspects of topology in magnetism. It first discusses how the topology in real space is relevant for a variety of magnetic spin structures, including domain walls, vortices, skyrmions, and dynamic excitations, and then focuses on the phenomena that are driven by distinct topology in reciprocal momentum space, such as anomalous and spin Hall effects, topological insulators, and Weyl semimetals. Lastly, it examines how topology influences dynamic phenomena and excitations (such as spin waves, magnons, localized dynamic solitons, and Majorana fermions). The book also shows how these developments promise to lead the transformative revolution of information technology.

Emerging Non-volatile Memory Technologies

Author : Wen Siang Lew
Publisher : Springer Nature
ISBN 13 : 9811569126
Total Pages : 439 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis Emerging Non-volatile Memory Technologies by : Wen Siang Lew

Download or read book Emerging Non-volatile Memory Technologies written by Wen Siang Lew and published by Springer Nature. This book was released on 2021-01-09 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a balanced and comprehensive guide to the core principles, fundamental properties, experimental approaches, and state-of-the-art applications of two major groups of emerging non-volatile memory technologies, i.e. spintronics-based devices as well as resistive switching devices, also known as Resistive Random Access Memory (RRAM). The first section presents different types of spintronic-based devices, i.e. magnetic tunnel junction (MTJ), domain wall, and skyrmion memory devices. This section describes how their developments have led to various promising applications, such as microwave oscillators, detectors, magnetic logic, and neuromorphic engineered systems. In the second half of the book, the underlying device physics supported by different experimental observations and modelling of RRAM devices are presented with memory array level implementation. An insight into RRAM desired properties as synaptic element in neuromorphic computing platforms from material and algorithms viewpoint is also discussed with specific example in automatic sound classification framework.

Particle-based Computer Simulations of Magnetic Skyrmions

Author : Jan Rothörl
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (142 download)

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Book Synopsis Particle-based Computer Simulations of Magnetic Skyrmions by : Jan Rothörl

Download or read book Particle-based Computer Simulations of Magnetic Skyrmions written by Jan Rothörl and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic skyrmions are topologically stabilized magnetic structures found in multilayer thin film systems. They are often described as two-dimensional quasi-particles evolving according to the Thiele equation. This description allows for computer simulations of skyrmion dynamics using Brownian dynamics simulations with an additional term that takes care of the skyrmion Hall effect. Such simulations are significantly more efficient than conventional methods such as micromagnetic or atomistic spin dynamics simulations and therefore allow for simulating larger skyrmion systems for longer. Modeling specific skyrmion systems with this equation requires knowledge of interaction potentials of skyrmions with each other and with magnetic material boundaries. This thesis presents an approach to determine these potentials directly from experiment without prior assumptions on the potential shape by using the iterative Boltzmann inversion method, which has been previously established in soft-matter systems. The interaction potentials are found to be purely repulsive for the micrometer sized skyrmions studied here. Based on these potentials, further simulations of skyrmion systems are performed showing a good agreement with experiments and allowing for a comparison of simulated and experimental skyrmion lattices. Besides the analysis of phase transitions and ordering, the analysis of large skyrmion systems also comprises the effect of the gyroscopic Magnus force on diffusion of skyrmions. Contrary to other systems containing diffusive particles, an increased skyrmion density can lead to an increase in diffusion if a sufficiently strong Magnus force is present. Moreover, pinning effects and their influence on free and current-induced skyrmion diffusion are investigated. This investigation motivates the development of two different methods to increase skyrmion diffusion at constant temperature by reducing the impact of pinning on skyrmions. The first method uses periodic perpendicular magnetic field excitations to change skyrmion sizes and thereby the effective pinning landscape in which skyrmions move. The second one uses periodic current excitations to move skyrmions out of pinning sites. Finally, the effect of tight confinements on skyrmion dynamics is investigated. Here, the skyrmion dynamics is not only affected by the skyrmion density but also by the commensurability of the skyrmion number with the confinement. When the number of skyrmions is commensurate with the confinement geometry, diffusion is significantly decreased. Building upon these results, the changes in ordering and dynamics of confined skyrmions due to applied currents are analyzed in the context of employing such confined skyrmion systems for reservoir computing.

Stability of Skyrmion Lattices and Symmetries of Quasi-two-dimensional Chiral Magnets

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (982 download)

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Book Synopsis Stability of Skyrmion Lattices and Symmetries of Quasi-two-dimensional Chiral Magnets by :

Download or read book Stability of Skyrmion Lattices and Symmetries of Quasi-two-dimensional Chiral Magnets written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently there has been substantial interest in realizations of skyrmions, in particular in quasi-two-dimensional (2D) systems due to increased stability resulting from reduced dimensionality. A stable skyrmion, representing the smallest realizable magnetic texture, could be an ideal element for ultradense magnetic memories. Here we use the most general form of the quasi-2D free energy with Dzyaloshinskii-Moriya interactions constructed from general symmetry considerations reflecting the underlying system. We predict that the skyrmion phase is robust and it is present even when the system lacks the in-plane rotational symmetry. In fact, the lowered symmetry leads to increased stability of vortex-antivortex lattices with fourfold symmetry and in-plane spirals, in some instances even in the absence of an external magnetic field. Our results relate different hexagonal and square cell phases to the symmetries of materials used for realizations of skyrmions. This will give clear directions for experimental realizations of hexagonal and square cell phases, and will allow engineering of skyrmions with unusual properties. We also predict striking differences in gyrodynamics induced by spin currents for isolated skyrmions and for crystals where spin currents can be induced by charge carriers or by thermal magnons. As a result, we find that under certain conditions, isolated skyrmions can move along the current without a side motion which can have implications for realizations of magnetic memories.

Chirality, Magnetism and Magnetoelectricity

Author : Eugene Kamenetskii
Publisher : Springer Nature
ISBN 13 : 3030628442
Total Pages : 587 pages
Book Rating : 4.0/5 (36 download)

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Book Synopsis Chirality, Magnetism and Magnetoelectricity by : Eugene Kamenetskii

Download or read book Chirality, Magnetism and Magnetoelectricity written by Eugene Kamenetskii and published by Springer Nature. This book was released on 2021-03-27 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses theoretical and experimental advances in metamaterial structures, which are of fundamental importance to many applications in microwave and optical-wave physics and materials science. Metamaterial structures exhibit time-reversal and space-inversion symmetry breaking due to the effects of magnetism and chirality. The book addresses the characteristic properties of various symmetry breaking processes by studying field-matter interaction with use of conventional electromagnetic waves and novel types of engineered fields: twisted-photon fields, toroidal fields, and magnetoelectric fields. In a system with a combined effect of simultaneous breaking of space and time inversion symmetries, one observes the magnetochiral effect. Another similar phenomenon featuring space-time inversion symmetries is related to use of magnetoelectric materials. Cross-coupling of the electric and magnetic components in these material structures, leading to the appearance of new magnetic modes with an electric excitation channel – electromagnons and skyrmions – has resulted in a wealth of strong optical effects such as directional dichroism, magnetochiral dichroism, and rotatory power of the fields. This book contains multifaceted contributions from international leading experts and covers the essential aspects of symmetry-breaking effects, including theory, modeling and design, proven and potential applications in practical devices, fabrication, characterization and measurement. It is ideally suited as an introduction and basic reference work for researchers and graduate students entering this field.

Introduction to Frustrated Magnetism

Author : Claudine Lacroix
Publisher : Springer Science & Business Media
ISBN 13 : 3642105890
Total Pages : 682 pages
Book Rating : 4.6/5 (421 download)

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Book Synopsis Introduction to Frustrated Magnetism by : Claudine Lacroix

Download or read book Introduction to Frustrated Magnetism written by Claudine Lacroix and published by Springer Science & Business Media. This book was released on 2011-01-12 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of highly frustrated magnetism has developed considerably and expanded over the last 15 years. Issuing from canonical geometric frustration of interactions, it now extends over other aspects with many degrees of freedom such as magneto-elastic couplings, orbital degrees of freedom, dilution effects, and electron doping. Its is thus shown here that the concept of frustration impacts on many other fields in physics than magnetism. This book represents a state-of-the-art review aimed at a broad audience with tutorial chapters and more topical ones, encompassing solid-state chemistry, experimental and theoretical physics.

Magnetism and Accelerator-Based Light Sources

Author : Hervé Bulou
Publisher : Springer Nature
ISBN 13 : 3030646238
Total Pages : 208 pages
Book Rating : 4.0/5 (36 download)

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Book Synopsis Magnetism and Accelerator-Based Light Sources by : Hervé Bulou

Download or read book Magnetism and Accelerator-Based Light Sources written by Hervé Bulou and published by Springer Nature. This book was released on 2021-02-17 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book collects the contributions of the seventh school on Magnetism and Synchrotron Radiation held in Mittelwihr, France, from 7 to 12 October 2018. It starts with an introduction to the physics of modern X-ray sources followed by a general overview of magnetism. Next, light / matter interaction in the X-ray range is covered with emphasis on different types of angular dependence of X-ray absorption spectroscopy and scattering. In the end, two domains where synchrotron radiation-based techniques led to new insights in condensed matter physics, namely spintronics and superconductivity, are discussed. The book is intended for advanced students and researchers to get acquaintance with the basic knowledge of X-ray light sources and to step into synchrotron-based techniques for magnetic studies in condensed matter physics or chemistry.

Recent Advances in Topological Ferroics and their Dynamics

Author : Robert L. Stamps
Publisher : Academic Press
ISBN 13 : 0081029217
Total Pages : 304 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Recent Advances in Topological Ferroics and their Dynamics by : Robert L. Stamps

Download or read book Recent Advances in Topological Ferroics and their Dynamics written by Robert L. Stamps and published by Academic Press. This book was released on 2019-10-18 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent Advances in Topological Ferroics and Their Dynamics, Volume 70 in the Solid State Physics series, provides the latest information on the branch of physics that is primarily devoted to the study of matter in its solid phase, especially at the atomic level. This prestigious serial presents timely and state-of-the-art reviews pertaining to all aspects of solid state physics. - Contains contributions from leading authorities in the study of solid state physics, especially at the atomic level - Informs and updates on all the latest developments in the field - Presents timely, state-of-the-art reviews pertaining to all aspects of solid state physics

Frustrated Spin Systems

Author : H. T. Diep
Publisher : World Scientific
ISBN 13 : 9814440744
Total Pages : 644 pages
Book Rating : 4.8/5 (144 download)

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Book Synopsis Frustrated Spin Systems by : H. T. Diep

Download or read book Frustrated Spin Systems written by H. T. Diep and published by World Scientific. This book was released on 2013 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers all principal aspects of currently investigated frustrated systems, from exactly solved frustrated models to real experimental frustrated systems, going through renormalization group treatment, Monte Carlo investigation of frustrated classical Ising and vector spin models, low-dimensional systems, spin ice and quantum spin glass. The reader can OCo within a single book OCo obtain a global view of the current research development in the field of frustrated systems.This new edition is updated with recent theoretical, numerical and experimental developments in the field of frustrated spin systems. The first edition of the book appeared in 2005. In this edition, more recent works until 2012 are reviewed. It contains nine chapters written by researchers who have actively contributed to the field. Many results are from recent works of the authors.The book is intended for postgraduate students as well as researchers in statistical physics, magnetism, materials science and various domains where real systems can be described with the spin language. Explicit demonstrations of formulas and full arguments leading to important results are given where it is possible to do so."

Skyrmions in Magnetic Materials

Author : Shinichiro Seki
Publisher : Springer
ISBN 13 : 3319246518
Total Pages : 73 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Skyrmions in Magnetic Materials by : Shinichiro Seki

Download or read book Skyrmions in Magnetic Materials written by Shinichiro Seki and published by Springer. This book was released on 2015-11-19 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This brief reviews current research on magnetic skyrmions, with emphasis on formation mechanisms, observation techniques, and materials design strategies. The response of skyrmions, both static and dynamical, to various electromagnetic fields is also covered in detail. Recent progress in magnetic imaging techniques has enabled the observation of skyrmions in real space, as well as the analysis of their ordering manner and the details of their internal structure. In metallic systems, conduction electrons moving through the skyrmion spin texture gain a nontrivial quantum Berry phase, which provides topological force to the underlying spin texture and enables the current-induced manipulation of magnetic skyrmions. On the other hand, skyrmions in an insulator can induce electric polarization through relativistic spin-orbit interaction, paving the way for the control of skyrmions by an external electric field without loss of Joule heating. Because of its nanometric scale, particle nature, and electric controllability, skyrmions are considered as potential candidates for new information carriers in the next generation of spintronics devices.

Optomagnonic Structures: Novel Architectures For Simultaneous Control Of Light And Spin Waves

Author : Evangelos Almpanis
Publisher : World Scientific
ISBN 13 : 9811220069
Total Pages : 370 pages
Book Rating : 4.8/5 (112 download)

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Book Synopsis Optomagnonic Structures: Novel Architectures For Simultaneous Control Of Light And Spin Waves by : Evangelos Almpanis

Download or read book Optomagnonic Structures: Novel Architectures For Simultaneous Control Of Light And Spin Waves written by Evangelos Almpanis and published by World Scientific. This book was released on 2021-01-18 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding, controlling and, more importantly, enhancing the interaction between light (photons) and spin waves (magnons) can be, among others, a step towards the realization of magnon-mediated microwave-to-optical transducers for quantum computing applications or hybrid solid-state spintronic-photonic interconnections. In this respect, the development of novel composite multifunctional micro/nanostructures — so-called optomagnonic — which simultaneously control optical and spin waves and enhance their interaction, is particularly attractive.This book constitutes a collective work, comprising seven chapters from leading researchers in the field of optomagnonics and related areas. Apart from exciting recent developments, it provides the necessary fundamental knowledge in an explanatory manner and, therefore, it is accessible to non-experts. It is suitable for PhD students, post-docs, and researchers who are willing to get engaged in optomagnonics, while selected parts could also serve as lecture material for advanced courses. With increasing demand for miniaturized optomagnonic devices, this book will be an important resource to researchers working on optomagnonics, magneto-optics, spintronics, as well as on hybrid micro/nano devices for information processing.