Title :
Thermal stability of longitudinal media for >20 Gbits/in2 recording
Author :
Abarra, E. Noel ; Sato, Hisateru ; Suzuki, Masaya ; Okamoto, Iwao
Author_Institution :
Fujitsu Labs. Ltd., Kanagawa, Japan
fDate :
9/1/2000 12:00:00 AM
Abstract :
The thermal stability of a CoCrPtB-based media for over 20 Gbit/in 2 recording is investigated by magnetometry and spin stand methods. Recent quaternary and 5-element alloys for longitudinal magnetic recording media show significantly reduced grain sizes compared to Co-Cr-Pt-Ta alloys for the same underlayer structure. Cr segregation was also enhanced and the Cr-rich regions between grains were wider than those of CoCrPtTa media. These resulted in significant gains in So /Nm necessary for high density and high data rate recording and also in the degradation of magnetic thermal stability. Although higher densities can be achieved by decreasing the bit aspect ratio, side erasure problems due to flux leakage from narrow write heads are worsened
Keywords :
boron alloys; chromium alloys; cobalt alloys; grain size; magnetic recording; platinum alloys; segregation; thermal stability; CoCrPtB; areal density; bit aspect ratio; grain size; longitudinal magnetic recording medium; magnetometry; overwrite; segregation; side erasure; spin stand; thermal stability; Chromium; Fabrication; Grain size; Magnetic flux leakage; Magnetic heads; Magnetic recording; Noise reduction; Signal to noise ratio; Thermal degradation; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
