Magneto Transport Properties Of Skyrmions And Chiral Spin Structures In Mnsi

Author : Tomoyuki Yokouchi
Publisher :
ISBN 13 : 9789813293861
Total Pages : 94 pages
Book Rating : 4.61/5 ( download)

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Download or read book Magneto-transport Properties of Skyrmions and Chiral Spin Structures in MnSi written by Tomoyuki Yokouchi and published by . This book was released on 2019 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides extensive and novel insights into transport phenomena in MnSi, paving the way for applying the topology and chirality of spin textures to the development of spintronics devices. In particular, it describes in detail the key measurements, e.g. magnetoresistance and nonlinear electronic transport, and multiple material-fabrication techniques based on molecular beam epitaxy, ion-beam microfabrication and micromagnetic simulation. The book also reviews key aspects of B20-type MnSi chiral magnets, which host magnetic skyrmions, nanoscale objects formed by helical spatial spin structures. Readers are then introduced to cutting-edge findings on the material. Furthermore, by reviewing the author's successful experiments, the book provides readers with a valuable update on the latest achievements in the measurement and fabrication of magnetic materials in spintronics.

Author : Tomoyuki Yokouchi
Publisher : Springer
ISBN 13 : 9813293853
Total Pages : 88 pages
Book Rating : 4.54/5 ( download)

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Download or read book Magneto-transport Properties of Skyrmions and Chiral Spin Structures in MnSi written by Tomoyuki Yokouchi and published by Springer. This book was released on 2019-08-14 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides extensive and novel insights into transport phenomena in MnSi, paving the way for applying the topology and chirality of spin textures to the development of spintronics devices. In particular, it describes in detail the key measurements, e.g. magnetoresistance and nonlinear electronic transport, and multiple material-fabrication techniques based on molecular beam epitaxy, ion-beam microfabrication and micromagnetic simulation. The book also reviews key aspects of B20-type MnSi chiral magnets, which host magnetic skyrmions, nanoscale objects formed by helical spatial spin structures. Readers are then introduced to cutting-edge findings on the material. Furthermore, by reviewing the author’s successful experiments, the book provides readers with a valuable update on the latest achievements in the measurement and fabrication of magnetic materials in spintronics.

Author : J. Ping Liu
Publisher : CRC Press
ISBN 13 : 1315284154
Total Pages : 447 pages
Book Rating : 4.56/5 ( download)

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Download or read book Skyrmions written by J. Ping Liu and published by CRC Press. This book was released on 2016-12-08 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The book reviews all the aspects of recent developments in research on skyrmions, from the presentation of the observation and characterization techniques to the description of physical properties and expected applications. It will be of great use for all scientists working in this field." – Albert Fert, 2007 Nobel Laureate in Physics (from the Foreword) A skyrmion is a tiny region of reversed magnetization – quasiparticles since they are not present except in a magnetic state, and also give rise to physics that cannot be described by Maxwell’s equations. These particles are fascinating subjects for theoretical and experimental studies. Moreover, as a new type of magnetic domain structure with special topological structures, skyrmions feature outstanding magnetic and transport properties and may well have applications in data storage and other advanced spintronic devices, as readers will see in this book. Chapters address the relationships between physical properties of condensed matter, such as the AB effect, Berry phase effect, quantum Hall effect, and topological insulators. Overall, it provides a timely introduction to the fundamental aspects and possible applications of magnetic skyrmions to an interdisciplinary audience from condensed matter physics, chemistry, and materials science.

Author : Naoya Kanazawa
Publisher : Springer
ISBN 13 : 4431556605
Total Pages : 96 pages
Book Rating : 4.02/5 ( download)

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Download or read book Charge and Heat Transport Phenomena in Electronic and Spin Structures in B20-type Compounds written by Naoya Kanazawa and published by Springer. This book was released on 2015-07-31 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents systematic experimental research on chiral-lattice crystals referred to as B20-type germanium compounds, especially focusing on skyrmion spin textures and Dirac electrons. An emergent electromagnetic field observed in MnGe demonstrates a formation of three-dimensional skyrmion crystals. Detection of skyrmions in nanoscale Hall bar devices made of FeGe is realized by measuring the topological Hall effect, a transport property reflecting emergent fields produced by skyrmions. By measuring the electron-filling dependence of thermopower in CoGe, a pronounced thermoelectric property in this compound is revealed to stem from the asymmetric density of states appearing at certain levels of Fermi energy in the Dirac electron state. The three main results named above will contribute to enriching a variety of novel electromagnetic responses of emergent gauge fields in solids, to realizing high-performance skyrmion-based magnetic memory, and to designing high-efficiency thermoelectric materials, respectively.

Author : Louise Desplat
Publisher : Springer Nature
ISBN 13 : 3030660265
Total Pages : 166 pages
Book Rating : 4.60/5 ( download)

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Download or read book Thermal Stability of Metastable Magnetic Skyrmions written by Louise Desplat and published by Springer Nature. This book was released on 2021-02-04 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The energy cost associated with modern information technologies has been increasing exponentially over time, stimulating the search for alternative information storage and processing devices. Magnetic skyrmions are solitonic nanometer-scale quasiparticles whose unique topological properties can be thought of as that of a Mobius strip. Skyrmions are envisioned as information carriers in novel information processing and storage devices with low power consumption and high information density. As such, they could contribute to solving the energy challenge. In order to be used in applications, isolated skyrmions must be thermally stable at the scale of years. In this work, their stability is studied through two main approaches: the Kramers' method in the form of Langer's theory, and the forward flux sampling method. Good agreement is found between the two methods. We find that small skyrmions possess low internal energy barriers, but are stabilized by a large activation entropy. This is a direct consequence of the existence of stable modes of deformation of the skyrmion. Additionally, frustrated exchange that arises at some transition metal interfaces leads to new collapse paths in the form of the partial nucleation of the corresponding antiparticle, as merons and antimerons.

Author : Jung Hoon Han
Publisher : Springer
ISBN 13 : 3319692461
Total Pages : 177 pages
Book Rating : 4.63/5 ( download)

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Download or read book Skyrmions in Condensed Matter written by Jung Hoon Han and published by Springer. This book was released on 2017-10-09 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes some of the most exciting theoretical developments in the topological phenomena of skyrmions in noncentrosymmetric magnetic systems over recent decades. After presenting pedagogical backgrounds to the Berry phase and homotopy theory, the author systematically discusses skyrmions in the order of their development, from the Ginzburg-Landau theory, CP1 theory, Landau-Lifshitz-Gilbert theory, and Monte Carlo numerical approaches. Modern topics, such as the skyrmion-electron interaction, skyrmion-magnon interaction, and various generation mechanisms of the skyrmion are examined with a focus on their general theoretical aspects. The book concludes with a chapter on the skyrmion phenomena in the cold atom context. The topics are presented at a level accessible to beginning graduate students without a substantial background in field theory. The book can also be used as a text for those who wish to engage in the physics of skyrmions in magnetic systems, or as an introduction to the various theoretical methods used in studying current condensed-matter systems.

Author : J. Ping Liu
Publisher : CRC Press
ISBN 13 : 1315284162
Total Pages : 502 pages
Book Rating : 4.63/5 ( download)

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Download or read book Skyrmions written by J. Ping Liu and published by CRC Press. This book was released on 2016-12-08 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The book reviews all the aspects of recent developments in research on skyrmions, from the presentation of the observation and characterization techniques to the description of physical properties and expected applications. It will be of great use for all scientists working in this field." – Albert Fert, 2007 Nobel Laureate in Physics (from the Foreword) A skyrmion is a tiny region of reversed magnetization – quasiparticles since they are not present except in a magnetic state, and also give rise to physics that cannot be described by Maxwell’s equations. These particles are fascinating subjects for theoretical and experimental studies. Moreover, as a new type of magnetic domain structure with special topological structures, skyrmions feature outstanding magnetic and transport properties and may well have applications in data storage and other advanced spintronic devices, as readers will see in this book. Chapters address the relationships between physical properties of condensed matter, such as the AB effect, Berry phase effect, quantum Hall effect, and topological insulators. Overall, it provides a timely introduction to the fundamental aspects and possible applications of magnetic skyrmions to an interdisciplinary audience from condensed matter physics, chemistry, and materials science.

Author : Bernd Zimmermann
Publisher : Forschungszentrum Jülich
ISBN 13 : 3893369856
Total Pages : 171 pages
Book Rating : 4.50/5 ( download)

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Download or read book Ab initio description of transverse transport due to impurity scattering in transition-metals written by Bernd Zimmermann and published by Forschungszentrum Jülich. This book was released on 2014 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Brian J. Youngblood
Publisher :
ISBN 13 : 9781339528854
Total Pages : 107 pages
Book Rating : 4.51/5 ( download)

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Download or read book Growth and Characterization of Skyrmion-hosting Magnetic Thin Films written by Brian J. Youngblood and published by . This book was released on 2016 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic skyrmions are particle-like knots of magnetization which are both highly stable under the proper conditions and at the same time very easy to move and rotate. These properties make them very promising as a basis for future spin electronic information storage and manipulation. At the same time, these structures exhibit interesting fundamental physics including emergent mass and electrodynamics and phase transitions including a crystalline state as well as being low-dimensional analogues of a model of low-energy sub-atomic particles. Accessibility to studying these objects is hampered by the fact that most skyrmion-hosting materials have to be grown either as single crystals or by molecular beam epitaxy (MBE). Also, predictive studies are currently mostly restricted to full numerical simulations because of the intractability of the equation describing skyrmion structure and a dearth of analytical approximations.In this dissertation, I present work on the sputter deposition of the skyrmion hosting chiral magnetic material MnSi. MnSi was the first material observed to exhibit a skyrmion state but it has not been made by sputtering until now. I demonstrate by x-ray diffractometry and electrical measurements that the sputter-deposited MnSi exhibits properties similar to those of MBE-grown thin films including hosting skyrmions. This will hopefully improve the accessibility of experimental studies of MnSi and skyrmions. I also present an approximation for skyrmion spatial profiles which can predict skyrmion structure in a physically interesting range of material parameters and external magnetic fields. Using this structural approximation it should be possible to predict skyrmion stability and behavior under different conditions more rapidly than is possible with numerical simulations.

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 0429805268
Total Pages : 646 pages
Book Rating : 4.64/5 ( download)

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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 646 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.