Download or read book Magnetic Phenomena in Interface engineered Multilayer Thin Films written by Ariam Mora-Hernandez and published by . This book was released on 2020 with total page 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 and Electronic Phenomena in Oxide Interfaces Thin Films and Heterostructures written by Stephen Barry Porter and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Thin Films Five Volume Set written by Hari Singh Nalwa and published by Academic Press. This book was released on 2001-10-29 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: This five-volume handbook focuses on processing techniques, characterization methods, and physical properties of thin films (thin layers of insulating, conducting, or semiconductor material). The editor has composed five separate, thematic volumes on thin films of metals, semimetals, glasses, ceramics, alloys, organics, diamonds, graphites, porous materials, noncrystalline solids, supramolecules, polymers, copolymers, biopolymers, composites, blends, activated carbons, intermetallics, chalcogenides, dyes, pigments, nanostructured materials, biomaterials, inorganic/polymer composites, organoceramics, metallocenes, disordered systems, liquid crystals, quasicrystals, and layered structures. Thin films is a field of the utmost importance in today's materials science, electrical engineering and applied solid state physics; with both research and industrial applications in microelectronics, computer manufacturing, and physical devices. Advanced, high-performance computers, high-definition TV, digital camcorders, sensitive broadband imaging systems, flat-panel displays, robotic systems, and medical electronics and diagnostics are but a few examples of miniaturized device technologies that depend the utilization of thin film materials. The Handbook of Thin Films Materials is a comprehensive reference focusing on processing techniques, characterization methods, and physical properties of these thin film materials.

Download or read book Interplay Between Magnetic and Dielectric Phenomena at Transition Metal Oxide Interfaces written by Daniel Schumacher and published by Forschungszentrum Jülich. This book was released on 2013 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Handbook of Materials Science Volume 2 written by Raghumani S. Ningthoujam and published by Springer Nature. This book was released on with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Techniques for Characterizing Magnetic Materials written by Yimei Zhu and published by Springer Science & Business Media. This book was released on 2005-12-06 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Techniques for Characterizing Magnetic Materials provides an extensive overview of novel characterization tools for magnetic materials including neutron, photon and electron scatterings and other microscopy techniques by world-renowned scientists. This interdisciplinary reference describes all available techniques to characterize and to understand magnetic materials, techniques that cover a wide range of length scales and belong to different scientific communities. The diverse contributions enhance cross-discipline communication, while also identifying both the drawbacks and advantages of different techniques, which can result in deriving effective combinations of techniques that are especially fruitful at nanometer scales. It will be a valuable resource for all graduate students, researchers, engineers and scientists who are interested in magnetic materials including their crystal structure, electronic structure, magnetization dynamics and their associated magnetic properties and underlying magnetism.

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 Recent Awards in Engineering written by and published by . This book was released on 1983 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface and Interface Magnetism in Nanostructures and Thin Films written by Natalie A. Frey and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Nanostructured systems composed of two or more technologically important materials are useful for device applications and intriguing for the new fundamental physics they may display. Magnetism at the nanoscale is dominated by size and surface effects which combined with other media lead to new spin dynamics and interfacial coupling phenomena. These new properties may prove to be useful for optimizing sensors and devices, increasing storage density for magnetic media, as well as for biomedical applications such as drug delivery, MRI contrast enhancement, and hyperthermia treatment for cancer. In this project we have examined the surface and interface magnetism of composite nanoparticles and multilayer thin films by using conventional DC magnetization and AC susceptibility as well as transverse susceptibility, a method for directly probing the magnetic anisotropy of materials. Au and Fe3O4 synthesized together into three different nanoparticle configurations and ranging in size for 60 nm down to 9nm are used to study how the size, shape, and interfaces affect the most fundamental properties of magnetism in the Au-Fe3O4 system. The findings have revealed ways in which the magnetic properties can be enhanced by tuning these parameters. We have shown that by changing the configurations of the Au and Fe3O4 particles, exotic behavior can be observed such as a large increase in anisotropy field (H[subscript]K ranging from 435 Oe to 1650 Oe) and the presence of exchange bias. Multilayer thin films have been studied as well which combine the important classes of ferromagnetic and ferroelectric materials. In one case, barium hexaferrite/barium strontium titanate thin films, the anisotropic behavior of the ferromagnet is shown to change due to the introduction of the secondary material. In the other example, CrO2/Cr2O3 bilayers, exchange coupling is observed as Cr2O3 is an antiferromagnet as well as a ferroelectric. This coupling is manifest as a uniaxial anisotropy rather than the unidirectional anisotropy associated with exchange biased bilayers. Not only will such multifunctional structures will be useful for technological applications, but the materials properties and configurations can be chosen and tuned to further enhance the desired functional properties.

Download or read book HFI NQI 2007 written by Alberto Pasquevich and published by Springer Science & Business Media. This book was released on 2010-04-08 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of proceedings includes new and original scientific results along with recent developments in instrumentation and methods, in invited and contributed papers. Researchers and graduate students interested in hyperfine interaction detected by nuclear radiation as well as nuclear quadrupole interactions detected by resonance methods in the areas of materials, biological and medical science will find this volume indispensable.

Download or read book Interface and Topology in Magnetism written by Ali Sucipto Tan and published by . This book was released on 2016 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores interface interactions, topology of spin structures, and the use of interface interactions in manipulating the topology of spin structures. First, I will present our work on interface interactions in magnetic thin film heterostructures. A majority of interesting phenomena in magnetic heterostructures are caused primarily by the interface interactions. In exchange bias system CoO/MgO/Fe/Ag(001), the role of frozen and rotatable antiferromagnetic spins in exchange bias system was investigated using X-ray Magnetic Linear Dichroism (XMLD). In the Py/FeMn/Ni/Cu(001) system, the indirect coupling through an antiferromagnetic spacer layer was studied through anisotropy measurements using Rotating-Field Magneto-Optical Kerr Effect (ROTMOKE). Second, I will present our work on artificial topological spin structures. Traditionally, research on nanostructured magnetic materials has focused on the study of uniformly magnetized thin films. With the increasing capability to prepare and manipulate non-uniform spin configurations in recent years, various topological spin structure have been realized. In magnetic thin films, magnetic vortex states can be stabilized by reducing the lateral dimension of the magnetic thin film to the nanoscale due to the increased shape anisotropy. By combining this shape anisotropy and interlayer exchange coupling at the interface, we showed that more complex topological spin structures such as spin skyrmions and hedgehog spin merons can be stabilized and manipulated. By utilizing uniaxial strain in a ferroelectric-ferromagnetic system Co/Cu/PMN-PT(011), we demonstrated a method to manipulate the circulation of a magnetic vortex state using strain.

Download or read book Study of Magnetic Thin Films and Magnetic Interfaces by Linear MOKE and Second Harmonic Generation written by Xiaojing Tan and published by . This book was released on 2009 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetism of Surfaces Interfaces and Nanoscale Materials written by Robert E. Camley and published by Elsevier. This book was released on 2015-10-27 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past 30 years, magnetic research has been dominated by the question of how surfaces and interfaces influence the magnetic and transport properties of nanostructures, thin films and multilayers. The research has been particularly important in the magnetic recording industry where the giant magnetoresistance effect led to a new generation of storage devices including hand-held memories such as those found in the ipod. More recently, transfer of spin angular momentum across interfaces has opened a new field for high frequency applications.This book gives a comprehensive view of research at the forefront of these fields. The frontier is expanding through dynamic exchange between theory and experiment. Contributions have been chosen to reflect this, giving the reader a unified overview of the topic. Addresses both theory and experiment that are vital for gaining an essential understanding of topics at the interface between magnetism and materials science Chapters written by experts provide great insights into complex material Discusses fundamental background material and state-of-the-art applications, serving as an indispensable guide for students and professionals at all levels of expertise Stresses interdisciplinary aspects of the field, including physics, chemistry, nanocharacterization, and materials science Combines basic materials with applications, thus widening the scope of the book and its readership

Download or read book Interactive phenomena in magnetic thin films written by Jian Gang Zhu and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Role of Microstructural Phenomena in Magnetic Thin Films written by and published by . This book was released on 1992 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject is germane to magnetic recording media. Results during the first 2 years are presented under the following headings: atomic resolution TEM of CoNiCr films; CoNiCr and CoCrTa thin films; development of texture; and CoSm/Cr thin films. The HREM results showed that defects in Co-based films may be responsible for higher coercivity. Findings are presented on the effects of Cr interlayers on the microstructure of the second Co-based film in Co/Cr/Co/Cr multilayer films. Proposed research plans are outlined.