Download or read book Investigation of Structural and Magnetic Properties of CoCrTa Co3O4 Pt Perpendicular Magnetic Thin Film Media and MFM Study of Ultra high Density Magnetic Bit Patterns written by Xing Song and published by . This book was released on 1996 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure and Magnetic Properties of CoCrTa Cr and CoCrTaPt Cr Alloy Thin Films for Ultra high Density Magnetic Recording written by Kyusik Sin and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stress Evolution Behavior in CoCrPt Alloy Thin Films with Varying Pt Concentration written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CoCrPt alloy thin film is one of the most promising candidates for ultrahigh density magnetic recording media. One of interesting issues for an application of ferromagnetic thin film to high density magnetic recording media is to investigate growth stress, since stress inevitably generated during thin film fabrication drastically alters magnetic properties as well as mechanical properties due to film fracture and buckling [1]. However, sufficient studies have not been addressed on in situ experimental investigation on stress evolution during film growth of magnetic thin film and its correlation with directly observed film growth structure. We have investigated in situ stress evolution of 400-Å (Co2Cr1){sub 100-x}Pt(subscript x)/1100-Å Ti alloy films with varying Pt concentration by means of an ultrahigh vacuum (UHV) chamber equipped with a highly sensitive optical deflection-detecting system [2]. Interestingly enough, the stress evolution patterns during the film deposition are remarkably changed with varying the Pt concentration. CoCrPt alloy films with lower Pt concentration (6 (less-than or equal to) x (less-than or equal to) 13) grow through compressive, tensile, and again compressive stress during film deposition, while CoCrPt alloy films with higher Pt concentration (21 (less-than or equal to) x (less-than or equal to) 28) develop with compressive and relaxed compressive stress without tensile stress generation. In situ stress-evolution behavior for 400-Å (Co82Cr18){sub 100-x}Pt(subscript x)/1100-Å Ti alloy films with the Pt concentrations of (a) 6, (b) 13, (c) 21, and (d) 28 at.% are demonstrated in Fig. 1. Here, the positive slope corresponds to tensile stress, while the negative slope implies compressive stress. The microstructural studies at the stress transition region reveal that film growth structure plays a major role in considerable change of stress evolution pattern in CoCrPt alloy films with the increase of Pt concentration.
Download or read book Structural and Magnetic Properties of Co Pt and Related Multilayer Thin Films written by Gerardo Antonio Bertero and published by . This book was released on 1995 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Advanced Thin Film Microstructure for Ultra high Density Magnetic Recording written by Tai Min and published by . This book was released on 1993 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimization of Composition and Structure of CoCrPt and CoCrPtB Thin Films for Very High Density Longitudinal Magnetic Recording Media written by Pawel Aleksander Glijer and published by . This book was released on 1995 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improvement of Crystallographic Characteristics of CoCrTa Thin Film Using Double Underlayer written by Y. J. Kim and published by . This book was released on 2001 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: High c-axis oriented CoCr-based thin films are expected for ultra-high density recording media in perpendicular magnetic recording system. In order to improve dispersion angle of c-axis of CoCr-based for perpendicular magnetic recording media, we prepared trilayered film with double underlayer using New Facing Targets Sputtering apparatus. The thickness of magnetic layer CoCrTa and double underlayer, such as interlayer Pt, paramagnetic CoCr, underlayer Ti was fixed 50 nm and 20 nm respectively. In order to prepare the thin film, we fixed argon gas pressure 1 m Torr, substrate temperature 250 deg C and input current 0.5 A. The crystallographic characteristics of CoCrTa layer with varying interlayer thickness (0 - 20 nm) have been investigated. By the result, the CoCrTa trilayered thin film with interlayer Pt showed good c-axis orientation 3.45 and 3.62 at thickness 5 nm and 10 nm respectively. However, CoCrTa thin film using interlayer paramagnetic CoCr showed 8.28 deg and 8.62 deg at thickness nm and 10 nm respectively.
Download or read book Structure and Magnetic Properties of Polycrystalline FePt and CoPt Thin Films for High Density Recording Media written by Sangki Jeong and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanostructure Science and Technology written by Richard W. Siegel and published by Springer Science & Business Media. This book was released on 1999-09-30 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Timely information on scientific and engineering developments occurring in laboratories around the world provides critical input to maintaining the economic and technological strength of the United States. Moreover, sharing this information quickly with other countries can greatly enhance the productivity of scientists and engineers. These are some of the reasons why the National Science Foundation (NSF) has been involved in funding science and technology assessments comparing the United States and foreign countries since the early 1980s. A substantial number of these studies have been conducted by the World Technology Evaluation Center (WTEC) managed by Loyola College through a cooperative agreement with NSF. The National Science and Technology Council (NSTC), Committee on Technology's Interagency Working Group on NanoScience, Engineering and Technology (CT/IWGN) worked with WTEC to develop the scope of this Nanostucture Science and Technology report in an effort to develop a baseline of understanding for how to strategically make Federal nanoscale R&D investments in the coming years. The purpose of the NSTC/WTEC activity is to assess R&D efforts in other countries in specific areas of technology, to compare these efforts and their results to U. S. research in the same areas, and to identify opportunities for international collaboration in precompetitive research. Many U. S. organizations support substantial data gathering and analysis efforts focusing on nations such as Japan. But often the results of these studies are not widely available. At the same time, government and privately sponsored studies that are in the public domain tend to be "input" studies.
Download or read book Structure Microstructure and Magnetic Properties of Electrodeposited Co and Co Pt in Different Nanoscale Geometries written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin films and nanowires of Co-Pt have been prepared by means of electrodeposition. Composition, structure, microstructure and magnetic properties have been intensively studied using X-ray diffraction, scanning electron microscopy and vibrating sample magnetometry and correlated to the deposition parameters such as electrolyte composition, deposition current and/or potential. Co rich Co-Pt films have been deposited at various current densities. A nearly constant composition of Co70Pt30 was achieved for current densities between 18 and 32 mA/cm2. Detailed texture measurements confirmed an increasing fraction of the hexagonal phase with its c-axis aligned perpendicular to the film plane with increasing current density. Accordingly, magnetic properties are strongly affected by the magnetocrystalline anisotropy of the hexagonal phase that competes with the shape anisotropy of the thin film geometry. Co-Pt nanowires have been prepared within alumina templates at different deposition potentials between -0.6 and -0.9VSCE changing the composition from nearly pure Pt to Co. The composition Co80Pt20 was observed at a deposition potential of -0.7VSCE. Co-Pt nanowires are nanocrystalline in the as-deposited state. Magnetic measurements reveal changing fcc and hcp phase fractions within the wires as the effective anisotropy significantly differs from the expected shape anisotropy for nanowires with high aspect ratio. This change in effective anisotropy is attributed to the preferential alignment of the c-axis of hcp Co-Pt phase perpendicular to the nanowires axis. A promising alternative with much smaller feature sizes is the diblock copolymer template. Electrodeposition of Co and Co-Pt into these templates has been carried out. Inhomogeneities in the template thickness as well as a certain substrate roughness have been identified to be the reasons for inhomogeneous template filling. Thus magnetic properties are dominated by large deposits found on top of the template. Additiona.
Download or read book Nanotechnology Research Directions IWGN Workshop Report written by R.S. Williams and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: energy production, environmental management, transportation, communication, computation, and education. As the twenty-first century unfolds, nanotechnology's impact on the health, wealth, and security of the world's people is expected to be at least as significant as the combined influences in this century of antibiotics, the integrated circuit, and human-made polymers. Dr. Neal Lane, Advisor to the President for Science and Technology and former National Science Foundation (NSF) director, stated at a Congressional hearing in April 1998, "If I were asked for an area of science and engineering that will most likely produce the breakthroughs of tomorrow, I would point to nanoscale science and engineering. " Recognizing this potential, the White House Office of Science and Technology Policy (OSTP) and the Office of Management and Budget (OMB) have issued a joint memorandum to Federal agency heads that identifies nanotechnology as a research priority area for Federal investment in fiscal year 2001. This report charts "Nanotechnology Research Directions," as developed by the Interagency W orking Group on Nano Science, Engineering, and Technology (IWGN) of the National Science and Technology Council (NSTC). The report incorporates the views of leading experts from government, academia, and the private sector. It reflects the consensus reached at an IWGN-sponsored workshop held on January 27-29, 1999, and detailed in contributions submitted thereafter by members of the V. S. science and engineering community. (See Appendix A for a list of contributors.
Download or read book Nanostructured Materials written by C. C. Koch and published by William Andrew Pub. This book was released on 2007 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials are one of the highest profile classes of materials in science and engineering today, and will continue to be well into the future. Potential applications are widely varied, including washing machine sensors, drug delivery devices to combat avian flu, and more efficient solar panels. Broad and multidisciplinary, the field includes multilayer films, atomic clusters, nanocrystalline materials, and nanocomposites having remarkable variations in fundamental electrical, optic, and magnetic properties. Nanostructured Materials: Processing, Properties and Applications, 2nd Edition is an extensive update to the exceptional first edition snapshot of this rapidly advancing field. Retaining the organization of the first edition, Part 1 covers the important synthesis and processing methods for the production of nanocrystalline materials. Part 2 focuses on selected properties of nanostructured materials. Potential or existing applications are described as appropriate throughout the book. The second edition has been updated throughout for the latest advances and includes two additional chapters.
Download or read book Nanostructured Materials and Nanotechnology written by Hari Singh Nalwa and published by Gulf Professional Publishing. This book was released on 2002 with total page 859 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology Provides comprehensive coverage of the dominant technology of the 21st century Written by a truly international list of contributors.
Download or read book Nanophase Materials written by G.C. Hadjipanayis and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanophase Materials is the first and, as yet, the only comprehensive book published in this new and exciting area of materials science. It gives a broad overview of the revolutionary new field of nanophase materials; a view which spans the materials, physics, and chemistry research communities at a tutorial level that is suitable for advanced undergraduates, graduate students, postdoctoral researchers, and experts or would-be experts in the science of nanostructured materials. The articles are authored by many of the world's most prominent scientists in this field. The book covers the diverse methods for synthesizing nanophase materials, a variety of subsequent processing methodologies, what is known about the structures of these materials on various length scales from atomic to macroscopic, and the properties of these unique and novel materials. The materials properties covered are mechanical, electronic, optical, and magnetic and hence span a wide range of important new opportunities for technological applications.
Download or read book Non equilibrium Processing of Materials written by C. Suryanarayana and published by Elsevier. This book was released on 1999-07-22 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid technological developments during the later half of the 20th century have demanded materials that are stronger, capable of use at much higher temperatures, more corrosion-resistant, and much less expensive than those currently used. These demands become even more significant on the threshold of the new century and the millennium. Significant improvements in properties can only be achieved by processing the materials under far-from-equilibrium (or non-equilibrium) conditions. Several new processing technologies have been developed during the past few decades including, rapid solidification, spray forming, mechanical alloying, ion mixing, vapor deposition, laser processing and plasma processing. Remarkable advances have been made in recent years in the science and technology of these processes used to synthesize, characterize, and apply these materials processed under non-equilibrium conditions. Some of these techniques have evolved from laboratory curiosity to commercial-scale manufacturing in just a few years. In other cases, industrial necessity prompted development of the technology, and the science followed later. The chapters in this book have been written by people who are world-recognized experts in their respective fields. Each chapter describes the principles, processing techniques, special features of the materials produced, and their applications. An extensive list of references is provided at the end of each chapter that will facilitate location of additional information on specific aspects of any technique.
Download or read book Nanostructured Materials written by Carl C. Koch and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructure science and technology has become an identifiable, if very broad and multidisciplinary, field of research and emerging application in recent years. It is one of the most visible and growing research areas in materials science in its broadest sense. Nanostructured materials include atomic clusters, layered (lamellar) films, filamentary structures, and bulk nanostructured materials. The common thread to these materials is the nanoscale dimensionality, i.e. at least one dimension less than 100 nm, more typically less than 50 nm. In some cases, the physics of such nanoscale materials can be very different from the macroscale properties of the same substance. The different, often superior, properties that can occur is the driving force behind the explosion in research interest in these materials. With the recent intense interest in this broad field, a number of books, articles and conferences have been published. The justification for yet another book is twofold. First, the speed of developments makes it necessary to record another snapshot of the field. Second, this book narrows the field into the study of synthesis, characterization, and properties relevant to applications that require bulk, and mainly inorganic materials.
Download or read book Mechanical Properties of Nanocrystalline Materials written by James C. M. Li and published by CRC Press. This book was released on 2011-09-02 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book concentrates on both understanding and development of nanocrystalline materials. The original relation that connects grain size and strength, known as the Hall-Petch relation, is studied in the nanometer grain size region. The breakdown of such a relation is a challenge. Why and how to overcome it? Is the dislocation mechanism still operating when the grain size is very small, approaching the amorphous limit? How do we go from the microstructure information to the continuum description of the mechanical properties?
