Download or read book Magnetic Behavior of 360 Domain Walls in Patterned Magnetic Thin Films written by Mark Daniel Mascaro and published by . This book was released on 2012 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: 360° transverse domain walls (360DWs), which form readily from transverse 180° domain walls (180DWs) of opposite sense, demonstrate qualitatively distinct behaviors from their constituent 180DWs and are therefore of interest both from a physics perspective and for their applications in future domain wall devices. This thesis presents experimental and modeling-based investigation of the properties and behaviors of 360DWs including formation, magnetostatic behaviors, and response to field, AC, and DC driving forces. The formation of 360DWs is first examined by simulation in a model nanowire. An injection system capable of producing 360DWs from a wire and an injection pad is presented and its behavior is analyzed both by simulation and experimentally through magnetic force microscopy and scanning electron microscopy with polarization analysis. Next, a model multilayer system is used to demonstrate the magnetostatic behavior of 360DWs, demonstrating a much reduced stray field compared to 180DWs and a strong interlayer pinning behavior that allows the 360DW to act as a programmable pinning site. The richness of this magnetostatic behavior is analyzed experimentally in a rhombic ring system which readily generates 360DWs during reversal. The action of 360DWs is shown to dominate the reversal process, reducing switching fields and showing multiple reversal pathways with a strong dependence on field history. Simulations are used to explore the response of the 360DW to field and DC and AC currents. This highlights 360DW behaviors quite distinct from those of 180DWs, including the inability to be positioned by an applied field and the ability to be destroyed in place. 360DWs are shown to have an intrinsic resonant behavior in the GHz range, the exact frequency of which is broadly tunable by an applied field. Resonance can be excited by an applied AC current, and in conjunction with DC can be used to pin and gate 360DW propagation at a geometric pinning site, using globally applied currents and without impact on nonpinned domain walls.

Download or read book Dynamic Processes in Magnetic Thin Films Domain Wall Motion and Ferromagnetic Resonance written by Carl Elliott Patton and published by . This book was released on 1967 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Ultra Thin Films Multilayers and Surfaces written by F. Petroff and published by Elsevier. This book was released on 1997-12-18 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Symposium on Magnetic Ultrathin Films, Multilayers and Surfaces, hosted by the European Materials Research Society, was held at the Palais de la Musique et des Congré in Strasbourg, France on June 4-7, 1996. Its central theme was the relationship of magnetic properties and device performance to structure at the nano and micrometer length scale. Research on the magnetism of surfaces, ultrathin films and multilayers has increased dramatically during recent years. This development was triggered by the discovery of coupling between ferromagnetic layers across nonmagnetic spacer layers and of the giant magnetoresistance effect in systems of reduced dimension using various micro and nanofabrication techniques has become a subject of special interest. It is certainly the promising application potential of these effects in new magnetic recording device geometries which causes this intensive research, which is done both by companies and at universities and research institutes. A selection of invited and contributed papers presented at the Symposium and accepted for publication is contained in this volume. The contents of these proceedings are organized into seven sections. A. Nanowires, Nanoparticles, Nanostructuring B. Ultrathin Films and Surfaces, Characterization C. Giant Magnetoresistance D. Coupling, Tunneling E. Growth, Structure, Magnetism F. Growth, Structure, Magnetoresistance G. Coupling, Magnetic processes, Magneto-optics. The first four sections contain invited and oral contributed papers in the listed research domains, while the last three sections contain the contributions presented during three large poster sessions.

Download or read book Domain Wall Creep in Magnetic Thin Films written by Frank L. Thiel and published by . This book was released on 1965 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Domains written by Alex Hubert and published by Springer Science & Business Media. This book was released on 2008-10-10 with total page 707 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers systematic and up-to-date treatment of the whole area of magnetic domains. It contains many contributions that have not been published before. The comprehensive survey of this important area gives a good introduction to students and is also interesting to researchers.

Download or read book Structure and Properties of Co based Thin Films and Multilayers with Perpendicular Magnetic Anisotrophy written by Grzegorz Jan Kusinski and published by . This book was released on 2001 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interfacial Magnetic Phenomena and Domain Engineering in Complex Oxide Thin Films and Nanostructures written by Binzhi Li and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in thin film growth technology to create complex oxide heterostructures with atomic-level precision have enabled the discovery of a wide range of novel physical phenomena at engineered interfaces. These phenomena arise from the complex interactions between the lattice, charge, spin, and orbital degrees of freedom that are highly sensitive to external stimuli such as strain, chemical doping, and electric and magnetic fields. Among these complex oxide systems, heterostructures consisting of layers with competing magnetic characteristics have attracted great attention from a fundamental perspective as well as for their potential applications in magnetic sensors, magnetic random access memory, and future spintronics devices. One of the fundamental building blocks of such devices is the exchange-bias (EB) effect which is typically associated with interfacial exchange interactions between a ferromagnetic (FM) and an antiferromagnetic (AFM) material. A similar effect has also been observed at interfaces between hard and soft FM layers, where the hard (soft) layer possesses high (low) coercivity and low (high) saturation magnetization. In analogy to AFM/FM interfaces, the biasing effect at FM/FM interfaces originates from the magnetic unidirectional anisotropy induced by the exchange interactions between the hard and soft FM layers. The exchange interactions in complex oxide heterostructures consisting of La0.7Sr0.3MnO3 (LSMO) and La0.7Sr0.3CoO3 (LSCO) layers were systematically studied. LSMO is a soft FM metal that shows coincident FM-to-paramagnetic (PM) and metal-to-insulator transitions at ~ 360 K in its bulk form. LSCO is a hard FM material and is known to show magneto-electronic phase separation (MEPS), where FM/metallic clusters are embedded in a non-magnetic/insulating matrix. Synchrotron radiation based resonant x-ray reflectivity, soft x-ray magnetic spectroscopy, and bulk magnetometry were used to investigate the magnetic and electronic structure of the LSMO/LSCO heterostructures. It was found that a 6 nm LSMO/ 6 nm LSCO heterostructure displayed unconventional magnetic switching behavior, which deviated from conventional metallic FM/FM systems in that reversible switching occurred not only within the soft LSMO layer but was also accompanied by the switching of a thin interfacial LSCO layer. This unique magnetic switching behavior was strongly dependent on the thickness of the LSCO layer. Soft x-ray magnetic spectroscopy allowed us to develop a physical picture where a form of MEPS occurred vertically through the LSCO film thickness and was driven by the competition between two different interfacial effects at the LSMO/LSCO and the LSCO/substrate interfaces. These findings provide further evidence of the high tunability of magnetic properties in complex oxide heterostructures through interface engineering. In addition, domain wall injection and propagation in LSMO nanowires was investigated to ascertain its potential for magnetic memory device applications. A nanofabrication process combining e-beam lithography and ion implantation was used to pattern LSMO thin films. With the help of state-of-the-art x-ray photoemission electron microscopy, the magnetic domain patterns in various nanowire structures were directly imaged and magnetic field-assisted domain wall injection and propagation processes were monitored. Detailed domain wall structures were identified and the range of magnetic fields needed to move the domain walls were determined. It was found that the domain wall structures in LSMO nanostructures differed from the ones found in permalloy (Ni81Fe19) and were dependent on the crystallographic orientation of the nanowires. Furthermore, electrical transport studies on LSMO nanowires were performed. Pd metal was identified as the ideal contact metal that showed Ohmic behavior and low contact resistance. Resistance measurements as a function of temperature and magnetic field indicated that the LSMO nanowires preserved the electrical properties of the LSMO thin film. These results provide insight on the effect of nanostructuring on the magnetic and electrical properties of complex oxide nanowires, and illustrate the possibility of their application in magnetic memory devices.

Download or read book Magnetic Domains and Techniques for Their Observation written by Roy Carey and published by . This book was released on 1966 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Manipulation of Magnetic Textures in Thin Films and Devices written by Robert Douglas Tolley and published by . This book was released on 2017 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control and manipulation of magnetic textures is promising for the development of next-generation data storage, memory and processing technologies. Towards this goal, domain wall manipulation in two materials systems are presented here and thoroughly evaluated. Domain walls in ferrimagnetic Cobalt-Terbium alloys and multilayers are created, moved and stabilized via thermal gradients and a static magnetic field and exploit the unique properties of the system across the magnetic compensation point. The response of the systems to thermal gradients is observed via Kerr microscopy and used to determine the positioning of domain walls within patterned devices. Magnetic skyrmions are discovered in thin-film multilayered stacks using an Pt/Co/Os/Pt heterostructures where the thin Osmium layer is used to break interfacial symmetry and enhance the Dzyaloshinskii-Moriya interaction. The resulting skyrmions are manipulated using temperature, magnetic field, and electric current, and special attention is paid to their motion and nucleation behavior. Skyrmions are observed to be formed by low applied currents from nucleation sites and by collapse of stripe textures. Patterned wires allow for the observation of skyrmion nucleation behavior in free space, as well as defect sites, and real-time Kerr microscopy imaging is presented of skyrmion and stripe dynamics. These systems are evaluated from a perspective of their growth, patterning, measurement, and the novel behavior of the magnetic textures.

Download or read book Static and Dynamic Behavior of Magnetic Thin film Heads written by Farage Ahmed Sherrima and published by . This book was released on 1986 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current pulse induced Domain Wall Motion in Patterned NiFe Thin Films Observed by Using Magnetic Force Microscopy written by Li Gan and published by . This book was released on 2000 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theoretical and Computational Analysis of 180 Magnetic Domain Wall Behavior of a Magnetoelastic Thin Film Under Torsional Stress written by Yoshimi Ikeuchi and published by . This book was released on 2000 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Domain Walls in Bubble Materials written by A. P. Malozemoff and published by Academic Press. This book was released on 2013-10-22 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Domain Walls in Bubble Materials covers the physics of domain walls in bubble domain materials. The book describes the microscopic origins and characteristics of the material parameters; the principles of domain statics and the Landau-Lifshitz equation, which is the basic equation of magnetization dynamics; and its physical significance. The text then discusses the experimental techniques, both static and dynamic, used in studying domain walls; the static internal structure of bubble-domain walls; the Bloch-wall dynamics based on one-dimensional solutions of the Landau-Lifshitz equation; and the wall-motion theory. The theory to low velocity phenomena in domain walls containing vertical Bloch; high-velocity radial and quasi-planar wall motions; and nonlinear bubble translation including the implications of the theory for bubble motion in devices, are also considered. The book further surveys special phenomena involving vibrations and wave motions of walls, and the effects of microwave-frequency fields on walls. Engineers and materials researchers involved in the development of practical bubble devices will find the book invaluable.

Download or read book Handbook of Spintronics written by Yongbing Xu and published by Springer. This book was released on 2015-10-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over two volumes and 1500 pages, the Handbook of Spintronics will cover all aspects of spintronics science and technology, including fundamental physics, materials properties and processing, established and emerging device technology and applications. Comprising 60 chapters from a large international team of leading researchers across academia and industry, the Handbook provides readers with an up-to-date and comprehensive review of this dynamic field of research. The opening chapters focus on the fundamental physical principles of spintronics in metals and semiconductors, including an introduction to spin quantum computing. Materials systems are then considered, with sections on metallic thin films and multilayers, magnetic tunnelling structures, hybrids, magnetic semiconductors and molecular spintronic materials. A separate section reviews the various characterisation methods appropriate to spintronics materials, including STM, spin-polarised photoemission, x-ray diffraction techniques and spin-polarised SEM. The third part of the Handbook contains chapters on the state of the art in device technology and applications, including spin valves, GMR and MTJ devices, MRAM technology, spin transistors and spin logic devices, spin torque devices, spin pumping and spin dynamics and other topics such as spin caloritronics. Each chapter considers the challenges faced by researchers in that area and contains some indications of the direction that future work in the field is likely to take. This reference work will be an essential and long-standing resource for the spintronics community.

Download or read book Magnetic Properties of Two dimensional Thin Films written by Hyuk Jae Choi and published by . This book was released on 2001 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Properties of Antiferromagnetic Oxide Materials written by Lamberto Duò and published by John Wiley & Sons. This book was released on 2010-04-16 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first focused treatment on a hot topic highlights fundamental aspects as well as technological applications arising from a fascinating area of condensed matter physics. The editors have excellent track records and, in light of the broadness of the topic, retain the focus on antiferromagnetic oxides. They thus cover such topics as dichroism in x-ray absorption, non-magnetic substrates, exchange bias, ferromagnetic-antiferromagnetic interface coupling and oxide multilayers, as well as imaging using soft x-ray microscopy. The result is a very timely monograph for solid state physicists and chemists, materials scientists, electrical engineers, physicists in industry, physical laboratory technicians, and suppliers of sensors.

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.