scholarly journals Role of thermodynamic fluctuations in magnetic recording (invited)

2007 ◽  
Vol 101 (9) ◽  
pp. 09B104 ◽  
Author(s):  
Ralph Skomski
Keyword(s):  
Magnetic Recording

Transmission Electron Microscopy studies of texture of Cr underlayer of magnetic recording hard disk

1991 ◽  
Vol 49 ◽  
pp. 580-581
Author(s):  
L. Tang ◽  
G. Thomas ◽  
M. R. Khan ◽  
S. L. Duan
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Magnetic Recording ◽  
Magnetic Thin Films ◽  
Magnetic Films ◽  
Substrate Bias ◽  
Epitaxial Relationship ◽  
Transmission Electron

Cr thin films are often used as underlayers for Co alloy magnetic thin films, such as Co1, CoNi2, and CoNiCr3, for high density longitudinal magnetic recording. It is belived that the role of the Cr underlayer is to control the growth and texture of the Co alloy magnetic thin films, and, then, to increase the in plane coercivity of the films. Although many epitaxial relationship between the Cr underlayer and the magnetic films, such as ﹛1010﹜Co/ {110﹜Cr4, ﹛2110﹜Co/ ﹛001﹜Cr5, ﹛0002﹜Co/﹛110﹜Cr6, have been suggested and appear to be related to the Cr thickness, the texture of the Cr underlayer itself is still not understood very well. In this study, the texture of a 2000 Å thick Cr underlayer on Nip/Al substrate for thin films of (Co75Ni25)1-xTix dc-sputtered with - 200 V substrate bias is investigated by electron microscopy.

The role of stress-induced anisotropy in longitudinal thin film magnetic recording media

1996 ◽  
Vol 79 (8) ◽  
pp. 5342 ◽  
Author(s):  
C. A. Ross ◽  
M. E. Schabes ◽  
R. Ranjan ◽  
G. Bertero ◽  
T. Chen
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Induced Anisotropy ◽  
Stress Induced Anisotropy

Roughness-Induced Shear- and Squeeze-Film Effects in Magnetic Recording—Part I: Analysis

1989 ◽  
Vol 111 (2) ◽  
pp. 220-227 ◽  
Author(s):  
Bharat Bhushan ◽  
Kristian To̸nder
Keyword(s):  
Magnetic Recording ◽  
Design Guidelines ◽  
Squeeze Film ◽  
Operating Parameters ◽  
Periodic Motions ◽  
Average Flow ◽  
Thickness Standard ◽  
Orientation Parameters ◽  
Rarefaction Effects

General analyses are developed to predict the role of surface roughness, rarefaction effects, and various operating parameters in thin-film gas lubrication. Both shear- and squeeze-film effects are considered. The squeeze-film analysis is developed for transient and periodic motions. The analyses are based on average flow (roughness) factors. The results are presented in terms of Knudsen number, h/σ (film thickness/standard deviations of composite roughness) and roughness-orientation parameters. The appropriate analyses presented in this paper are simple and can be applied to magnetic recording and other applications to provide design guidelines.

The role of Ta and Pt in segregation within Co-Cr-Ta and Co-Cr-Pt thin film magnetic recording media

1996 ◽  
Vol 79 (8) ◽  
pp. 5345 ◽  
Author(s):  
K. M. Kemner ◽  
V. G. Harris ◽  
V. Chakarian ◽  
Y. U. Idzerda ◽  
W. T. Elam ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media

Control of Surface Finishing Residual Stresses in Magnetic Recording Head Materials

1988 ◽  
Vol 110 (1) ◽  
pp. 87-92 ◽  
Author(s):  
S. Chandrasekar ◽  
B. Bhushan
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Magnetic Recording ◽  
Surface Finishing ◽  
Recording Head ◽  
Surface Residual Stresses ◽  
Mechanical And Physical Properties ◽  
Magnetic Recording Head ◽  
Processing Techniques

Surface finishing of magnetic recording head materials, such as ferrites, by diamond grinding and lapping results in a residual compressive stress on the surface. Residual stresses alter the magnetic properties of the ferrite causing the recording head performance to deteriorate. Hence, they need to be minimized. This paper considers the role of two processing techniques—annealing and chemical lapping—in controlling residual stress in ferrites. The effect of these processing techniques on various mechanical and physical properties of finished ferrites and the mechanism of residual stress control are discussed.

Effects of Mobile and Chemically Bonded Molecules of Molecularly Thin Lubricant Film on the Vibrational Stability of a Sliding Ball

2004 ◽  
Author(s):  
Kentaro Tanaka ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato ◽  
Katsumi Iwamoto
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Direct Contact ◽  
Disk Surface ◽  
Lubricant Film ◽  
Load Range ◽  
Molecularly Thin Lubricant ◽  
The Stability

Lubrication by an extremely thin film has become very important in micro machines, magnetic recording disks and so on. Molecularly thin perfluoropolyether (PFPE) films are considered a good lubricant for these micro devices. When the thickness of the PFPE film is thinned to several nanometers, it is possible to assume that the film consists of mobile and chemically bonded molecules. In this paper, we investigated the role of these molecules from the viewpoint of the vibrational stability of the sliding ball with the disk surface. From experiments by the ball on disk type tribotester, it is found that chemically bonded molecules prevent direct contact between the slider and the disk surface. Furthermore, when mobile molecules exist on bonded molecules, the stability is improved in wide load range.

Role of Oxygen Incorporation in Co-Cr-Pt-Si-O Perpendicular Magnetic Recording Media

2004 ◽  
Vol 40 (4) ◽  
pp. 2498-2500 ◽  
Author(s):  
M. Zheng ◽  
B.R. Acharya ◽  
G. Choe ◽  
J.N. Zhou ◽  
Z.D. Yang ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Perpendicular Magnetic Recording ◽  
Oxygen Incorporation
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