Possibility as a magnetic recording media of austenitic stainless steel using stress-induced phase transformation

1999 ◽  
Vol 193 (1-3) ◽  
pp. 466-469 ◽  
Author(s):  
H Ishigaki ◽  
Y Konishi ◽  
K Kondo ◽  
K Koterazawa
Keyword(s):  
Stainless Steel ◽  
Phase Transformation ◽  
Austenitic Stainless Steel ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media

A multi-functional testing instrument for heat assisted magnetic recording media

2014 ◽  
Vol 115 (17) ◽  
pp. 17B726 ◽  
Author(s):  
H. Z. Yang ◽  
Y. J. Chen ◽  
S. H. Leong ◽  
C. W. An ◽  
K. D. Ye ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Recording Media ◽  
Functional Testing ◽  
Magnetic Recording Media ◽  
Testing Instrument ◽  
Heat Assisted Magnetic Recording

Lubricant Removal, Degradation, and Recovery on Particulate Magnetic Recording Media

1992 ◽  
Vol 114 (1) ◽  
pp. 61-67 ◽  
Author(s):  
V. J. Novotny ◽  
T. E. Karis ◽  
N. W. Johnson
Keyword(s):  
Bulk Viscosity ◽  
Magnetic Recording ◽  
Photoelectron Spectroscopy ◽  
Removal Rate ◽  
Lateral Diffusion ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Removal Rates ◽  
Linear Chains ◽  
Mechanical Durability

Lubrication of particulate magnetic recording media improves their mechanical durability in sliding and flying by several orders of magnitude compared with unlubricated media. Lubricant removal, degradation, and recovery were studied using microslit scanning Fourier transform infrared spectroscopy and microspot scanning X-ray photoelectron spectroscopy. These techniques measure the total and surface lubricant amounts in the porous film, respectively. Lubricant dynamics were compared for two physisorbed polyperfluoroalkylether lubricants of similar molecular weight but different molecular structure—Y with a CF3 side group and Z with linear chains. The bulk viscosity of Y was about ten times higher than the viscosity of Z. In sliding, the lubricant removal rate of Y was significantly higher than that of Z while in flying the removal rates were reversed. Removal rates in sliding were orders of magnitude higher than those in flying. Effective lateral diffusion coefficients estimated from the rate of lubricant reflow back to the depleted tracks were close to inversely proportional to the bulk viscosity. During sliding and flying both lubricants degraded as evidenced by chemically altered lubricant detected on the surfaces after dissolution of undegraded lubricant.

Development of CoX/Pd multilayer perpendicular magnetic recording media with granular seed layers

2002 ◽  
Vol 242-245 ◽  
pp. 297-303 ◽  
Author(s):  
Yukiko Kubota ◽  
Dieter Weller ◽  
Mei-Ling Wu ◽  
Xiaowei Wu ◽  
Ganping Ju ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Perpendicular Magnetic Recording ◽  
Seed Layers

Magnetic Characterization of SUS316L Deformed by High Pressure Torsion

2011 ◽  
Vol 239-242 ◽  
pp. 1300-1303
Author(s):  
Hong Cai Wang ◽  
Minoru Umemoto ◽  
Innocent Shuro ◽  
Yoshikazu Todaka ◽  
Ho Hung Kuo
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Stainless Steel ◽  
Phase Transformation ◽  
Austenitic Stainless Steel ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Austenitic Matrix ◽  
Magnetic Characterization

SUS316L austenitic stainless steel was subjected to severe plastic deformation (SPD) by the method of high pressure torsion (HPT). From a fully austenitic matrix (γ), HPT resulted in phase transformation from g®a¢. The largest volume fraction of 70% a¢ was obtained at 0.2 revolutions per minute (rpm) while was limited to 3% at 5rpm. Pre-straining of g by HPT at 5rpm decreases the volume fraction of a¢ obtained by HPT at 0.2rpm. By HPT at 5rpm, a¢®g reverse transformation was observed for a¢ produced by HPT at 0.2rpm.

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