Title :
Low noise Co-Cr-Nb perpendicular recording media with high squareness
Author :
Honda, Naoki ; Ariake, Jun ; Ouchi, Kazuhiro ; Iwasaki, Shun-ichi
Author_Institution :
Akita Res. Inst. of Adv. Technol., Japan
fDate :
7/1/1998 12:00:00 AM
Abstract :
Co-Cr based perpendicular recording media with high perpendicular squareness, SQ⊥, were developed by sputter-deposition, and their noise properties as well as recording performances were studied. It was found that the medium noise strongly correlated to Ms·δ3/2(1-SQ⊥) 1/2, where Ms and δ are saturation magnetization and the thickness of the medium, respectively. Thus a 50 nm thick Co-Cr-Nb medium with a high SQ⊥ of 0.74 exhibited the lowest noise among the investigated films. A high S/N of 38 dB for a track width of 2.7 μm with a D50 of 155 kFRPI was obtained for the Co-Cr-Nb medium by using a MR head. This medium could be used for a recording density of 5 Gbit/in2
Keywords :
chromium alloys; cobalt alloys; magnetic heads; magnetic recording noise; magnetic thin films; magnetoresistive devices; niobium alloys; perpendicular magnetic recording; Co-Cr-Nb; film thickness; magnetoresistive head; noise properties; perpendicular recording media; recording performances; saturation magnetization; sputter-deposition; squareness; Magnetic films; Magnetic heads; Magnetic moments; Magnetic noise; Noise level; Noise reduction; Performance analysis; Perpendicular magnetic recording; Saturation magnetization; Writing;
Journal_Title :
Magnetics, IEEE Transactions on
