Title :
Read/write characteristics of Co-Zn ferrite rigid disks in contact mode recording
Author :
Matsushita, Nobuhiro ; Morisako, Akimitsu ; Nakagawa, Sachiko ; Naoe, Masayuki
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol.
fDate :
9/1/1996 12:00:00 AM
Abstract :
Co-Zn ferrite films were deposited at substrate temperature Ts from 90 to 500°C by using facing targets sputtering. Specimen films deposited at Ts of 200°C and below were composed of crystallites with excellent (111) orientation and possessed a very flat surface, where the center-line average roughness Ra was 2.5 nm. The saturation magnetization 4πMs took a maximum value of 4.8 kG at Ts of 250°C and the in-plane and perpendicular coercivities Hc|| and Hc⊥ were both 1.5 kOe. A high linear recording density of 105 kFRPI was achieved for a specimen disk with Co-Zn ferrite film deposited at 200°C by using a MIG type head with gap length of 0.27 μm
Keywords :
cobalt compounds; coercive force; ferrite devices; ferrites; hard discs; magnetic recording; magnetic thin film devices; magnetisation; sputter deposition; surface topography; zinc compounds; (111) orientation; 0.27 mum; 90 to 500 C; Co-Zn ferrite rigid disks; CoZnFe2O4; MIG type head; center-line average roughness; contact mode recording; crystallites; facing targets sputtering; gap length; high linear recording density; in-plane coercivity; perpendicular coercivity; read/write characteristics; saturation magnetization; substrate temperature; very flat surface; Coercive force; Crystallization; Disk recording; Ferrite films; Rough surfaces; Saturation magnetization; Sputtering; Substrates; Surface roughness; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
