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 Structure of Materials written by Marc De Graef and published by Cambridge University Press. This book was released on 2012-10-08 with total page 773 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new edition of the highly readable textbook applying the fundamentals of crystallography, symmetry and diffraction to a range of materials.
Download or read book CoPt and FePt Thin Films for High Density Recording Media written by J. A. Christodoulides and published by . This book was released on 2000 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Granular CoPt/C and FePt/C films, consisting of nanoparticles of the highly anisotropic fct CoPt (FePt) phase embedded in a carbon matrix, were made by co-sputtering from pure Co50Pt50 (Fe50Pt50) and C targets using a tandem deposition mode. The as-made films showed a disordered face centered cubic (fcc) structure, which was magnetically soft and had low coercivity. Magnetic hardening occurred after heat treatment at elevated temperatures, which led to increase in coercivity with values up to 15 kOe. The hardening originated from the transformation of the fcc phase to a highly anisotropic face centered tetragonal phase (fct) with anisotropy K> 10(exp 7) erg/cu cm. Transmission electron microscopy studies showed FePt particles embedded in C matrix with a particle size increasing from below 5 nm in the as-made state to 15 nm in the fully annealed state. These results are very promising and make these materials potential candidates for high-density magnetic recording.
Download or read book Microstructural and Magnetic Characterization of CoPt and FePt Thin Films written by Roger A. Ristau and published by . This book was released on 1998 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructure of sputtered, 10 nm thin films of equiatomic binary alloys of CoPt and FePt were characterized using transmission electron microscopy (TEM) and related techniques, and the magnetic properties of these films were studied using a superconducting quantum interference device (SQUID) magnetometer. These films have certain properties important to their possible application as high density magnetic storage media, however the relationship of microstructure and magnetic properties was not well known. Grain growth kinetics were examined using manual and digital analysis of bright field TEM images, and were seen to take two stages during annealing in these films. A rapid growth stage concurrent with the formation of a (111) fiber texture was observed to occur within the first 5-10 minutes of annealing, which was followed by a much slower growth stage after the fiber texturing was well advanced. Differences in grain growth rate and ultimate grain size were also observed to depend on heating rate. The transformation from an atomically disordered structure to the L1$\sb0$ ordered structure also occurred during annealing and was characterized using digital analysis of dark field TEM images. The transformation was observed to follow first-order, nucleation and growth kinetics and the volume fraction transformed was quantified for numerous intermediate steps between disordered and fully ordered. The ordered volume fraction was then compared to the magnetic coercivity data obtained from the SQUID magnetometer. In contrast to the relationship most commonly described in the literature, that the highest coercivity corresponds to a two phase ordered/disordered mixture, the maximum value for coercivity in our samples was found to correspond to the fully ordered state. Furthermore, measurements of the ordered volume fraction at intermediate steps between disordered and fully ordered showed that the coercivity was closely related to the ordered volume fraction. An increasing density of magnetic domain wall pinning sites concurrent with the increasing ordered fraction was proposed as a mechanism for the high coercivity in these films.
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 Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 608 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 Polycrystalline Metal and Magnetic Thin Films written by and published by . This book was released on 2000 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanocomposite Science and Technology written by Pulickel M. Ajayan and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, nanocomposites have captured and held the attention and imagination of scientists and engineers alike. Based on the simple premise that by using a wide range of building blocks with dimensions in the nanosize region, it is possible to design and create new materials with unprecedented flexibility and improvements in their physical properties. This book contains the essence of this emerging technology, the underlying science and motivation behind the design of these structures and the future, particularly from the perspective of applications. It is intended to be a reference handbook for future scientists and hence carries the basic science and the fundamental engineering principles that lead to the fabrication and property evaluation of nanocomposite materials in different areas of materials science and technology.
Download or read book Study of Advanced Thin Film Media for High Density Magnetic Recording written by Xiao-Guang Ye and published by . This book was released on 1995 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polycrystalline Metal and Magnetic Thin Films 2000 Volume 615 written by Bruce M. Clemens and published by . This book was released on 2001-04-09 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2001 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Survey of Magnetic Thin Film Materials written by George William Reimherr and published by . This book was released on 1964 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetic Materials Processes and Devices 10 written by S. Krongelb and published by The Electrochemical Society. This book was released on 2009-05 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This issue of ECS Transactions brings together the work of electrochemists, physicists, engineers, and device designers working in the area of magnetic thin-film technology. Topics include electrochemical and electroless plating systems, etching, process chemistry, tool design, process control, film nucleation and growth, structure of deposits, stress, physics and micromagnetics of films, thermal and magnetic annealing. Applications include the fabrication of data recording systems, sensors, microelectrochemical systems (MEMS) and other magnetic devices.
Download or read book Frontiers in Materials Science written by B. Raj and published by Universities Press. This book was released on 2005 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents contributions by a galaxy of eminent scientists and technologists from the world over in broad spectrum of areas in materials science, providing a global perspective on complex issues of current concern and the direction of research in these areas.
Download or read book 1995 Digests of INTERMAG 95 written by and published by . This book was released on 1995 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
