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 Microstructure and Magnetic Properties of FePt MgO Multilayered Thin Films written by Yang Fu and published by . This book was released on 2006 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Functional Nanostructures written by Sudipta Seal and published by Springer Science & Business Media. This book was released on 2010-06-02 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book about functional nanostructures. Nanocrystalline materials exhibit outstanding properties and represent a new class of structural materials having a wide range of applications. In particular, there is considerable interest in developing nanocrystalline materials to be used as functional materials in aerospace applications, automotive industry, wear applications, etc. Future progress in these high technological applications of nanocrystalline materials depends on development of new methods of their fabrication and understanding of the underlying nano-scale and interface effects causing their unique mechanical properties.

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 Magnetic and Electronic Films Microstructure Texture and Application to Data Storage Volume 721 written by Patrick W. DeHaven and published by . This book was released on 2002-08-02 with total page 336 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 Metallic Films for Electronic Optical and Magnetic Applications written by Katayun Barmak and published by Woodhead Publishing. This book was released on 2014-02-13 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallic films play an important role in modern technologies such as integrated circuits, information storage, displays, sensors, and coatings. Metallic Films for Electronic, Optical and Magnetic Applications reviews the structure, processing and properties of metallic films. Part one explores the structure of metallic films using characterization methods such as x-ray diffraction and transmission electron microscopy. This part also encompasses the processing of metallic films, including structure formation during deposition and post-deposition reactions and phase transformations. Chapters in part two focus on the properties of metallic films, including mechanical, electrical, magnetic, optical, and thermal properties. Metallic Films for Electronic, Optical and Magnetic Applications is a technical resource for electronics components manufacturers, scientists, and engineers working in the semiconductor industry, product developers of sensors, displays, and other optoelectronic devices, and academics working in the field. Explores the structure of metallic films using characterization methods such as x-ray diffraction and transmission electron microscopy Discusses processing of metallic films, including structure formation during deposition and post-deposition reactions and phase transformations Focuses on the properties of metallic films, including mechanical, electrical, magnetic, optical, and thermal properties

Download or read book Microstructure and Magnetic Property of L1o CoPt 20 At C Magnetic Thin Film written by D. Y. Oh and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CoPt-20at.%C thin films of 20nm thickness were sputter-deposited in the form of CoPt/C(n) (n=1: carbon layer thickness=4nm; n=4: each carbon layer thickness=1nm) and were transformation-annealed at 650 degrees C for various times. Carbon was found to dissolve into CoPt lattice and enlarge the c/a ratio of the ordered CoPt lattice. The amount of carbon dissolution increases with the decreasing carbon layer thickness at a given total carbon concentration. The carbon dissolution larger than a critical amount can lead to a shift of the phase equilibrium of ordering and produce a stable fine two-phase mixture of ordered and disordered phases at the equi-atomic composition of Co:Pt. This results in a fine and uniform stagnant grain structure of about 20nm on annealing at 650 degrees C. The carbon dissolution by increasing the c/a ratio of the ordered CoPt lattice reduces both the saturation magnetization and the magnetocrystalline anisotropy constant of the film and leads to a reduction of coercivity of CoPt films.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic and Microstructural Properties of Sputter deposited Amorphous CoSm Thin Films written by Yukiko Kubota and published by . This book was released on 1998 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Journal of Nanotechnology written by and published by . This book was released on 2004 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Role of Microstructural Phenomena in Magnetic Thin Films Final Report written by and published by . This book was released on 2001 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the period of the program we systematically varied microstructural features of magnetic thin films in an attempt to better identify the role which each feature plays in determining selected extrinsic magnetic properties. This report summarizes the results.

Download or read book Microstructure and Magnetic Properties of CoNiCr Cr Thin Film Disks written by Kay Chyng-Huei Lin and published by . This book was released on 1989 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth Structure and Magnetic Properties of Magnetron Sputtered FePt Thin Films written by Valentina Cantelli and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical Properties of Nanorods written by Roman Krahne and published by Springer Science & Business Media. This book was released on 2013-06-12 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inorganic nanoparticles are among the most investigated objects nowadays, both in fundamental science and in various technical applications. In this book the physical properties of nanowires formed by nanoparticles with elongated shape, i.e. rod-like or wire-like, are described. The transition in the physical properties is analyzed for nanorods and nanowires consisting of spherical and rod-like nanoparticles. The physical properties of nanowires and elongated inorganic nanoparticles are reviewed too. The optical, electrical, magnetic, mechanical and catalytic properties of nanowires consisting of semiconductors, noble and various other metals, metal oxides properties and metal alloys are presented. The applications of nanorods and nanowires are discussed in the book.

Download or read book Inorganic Nanoparticles written by Claudia Altavilla and published by CRC Press. This book was released on 2017-12-19 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the various nanomaterials, inorganic nanoparticles are extremely important in modern technologies. They can be easily and cheaply synthesized and mass produced, and for this reason, they can also be more readily integrated into applications. Inorganic Nanoparticles: Synthesis, Applications, and Perspectives presents an overview of these special materials and explores the myriad ways in which they are used. It addresses a wide range of topics, including: Application of nanoparticles in magnetic storage media Use of metal and oxide nanoparticles to improve performance of oxide thin films as conducting media in commercial gas and vapor sensors Advances in semiconductors for light-emitting devices and other areas related to the energy sector, such as solar energy and energy storage devices (fuel cells, rechargeable batteries, etc.) The expanding role of nanosized particles in the field of catalysis, art conservation, and biomedicine The book’s contributors address the growing global interest in the application of inorganic nanoparticles in various technological sectors. Discussing advances in materials, device fabrication, and large-scale production—all of which are urgently required to reduce global energy demands—they cover innovations in areas such as solid-state lighting, detailing how it still offers higher efficiency but higher costs, compared to conventional lighting. They also address the impact of nanotechnology in the biomedical field, focusing on topics such as quantum dots for bioimaging, nanoparticle-based cancer therapy, drug delivery, antibacterial agents, and more. Fills the informational gap on the wide range of applications for inorganic nanoparticles in areas including biomedicine, electronics, storage media, conservation of cultural heritage, optics, textiles, and cosmetics Assembling work from an array of experts at the top of their respective fields, this book delivers a useful analysis of the vast scope of existing and potential applications for inorganic nanoparticles. Versatile as either a professional research resource or textbook, this effective tool elucidates fundamentals and current advances associated with design, characterization, and application development of this promising and ever-evolving device.

Download or read book Microstructure and Magnetic Properties of Cobalt based Thin Films for Magnetic Recording written by Li Tang and published by . This book was released on 1992 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: