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Author: Sa Huang
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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Author: Sa Huang
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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Author: Sangki Jeong
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Roger A. Ristau
Publisher:
ISBN:
Category : Iron alloys
Languages : en
Pages : 362
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Book Description
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.
Author: George William Reimherr
Publisher:
ISBN:
Category : Magnetic materials
Languages : en
Pages : 64
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Author: B. J. Nicholson
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 284
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Book Description
This report comprises a selective survey of the present knowledge of the effects of occluded gases and strains on the magnetic properties of Permalloy films, particularlly those which have significance for computer switching applications. Other possible techniques for accomplishing future computer switching functions and magnetic film properties are reviewed. Bulk properties are described and compared with corresponding thin film properties. The magnetic properties of epitaxial Permalloy, epitaxial nickel, epitaxial iron, polycrystalline nickel, and polycrystalline iron films are discussed. The effects of various occluded gases on magnetic film properties are summarized. Stresses present in evaporated films and their significance in determining the magnetic properties of thin films are considered. A selected bibliography of 548 references is included. (Author).
Author: Hyuk Jae Choi
Publisher:
ISBN:
Category :
Languages : en
Pages : 262
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Author: A. Fert
Publisher: Elsevier
ISBN: 0444596690
Category : Technology & Engineering
Languages : en
Pages : 642
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Book Description
Materials Research in thin and ultrathin magnetic structures is a multidisciplinary field which heavily relies on state-of-the-art growth, characterization and theoretical approaches to build a comprehensive physical picture on how magnetic properties depend on interfacial structural issues, interlayer coupling and transport phenomena. Often in this field, the critical properties and characterization required necessitates knowledge of structural and magnetic phenomena extending over several atomic planes. Atomic controlled growth techniques are required and atomic sensitivity is needed from magnetic and structural probes. This critical knowledge is vital for device applications, providing the basis for the synergistic interactions that are predominant in this field of research. This volume is the definitive reference source for anyone interested in the latest advances and results of current experimental research in ultrathin film magnetism.
Author: Yih-Chiang Wen
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Author: John B. Goodenough
Publisher:
ISBN:
Category : Metallic films
Languages : en
Pages : 42
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Author: Wenli Guo
Publisher:
ISBN:
Category :
Languages : en
Pages : 300
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