Title :
Small -dHc/dT characteristics of CoPt granular and thin film recording media
Author :
Kikitsu, A. ; Yusu, K. ; Ichihara, K. ; Tanaka, T.
Author_Institution :
Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan
fDate :
7/1/1998 12:00:00 AM
Abstract :
The temperature dependence of the coercivity Hc was measured for CoPt-based thin film, CoPt-SiO2 granular film and CoCr-based thin film recording media. All the samples showed a linear decrease in Hc with temperature, -dHc/dT. It is found that CoPt-based media have smaller -dHc/dT values than CoCr-based one. This means that CoPt-based media have good stability for archival and read/write characteristics at elevated temperatures. From a theoretical discussion, it is also found that CoPt-based thin film and granular media with small activating magnetic moment value are expected to have smaller recording coercivity than CoCr-based media
Keywords :
chromium alloys; cobalt alloys; coercive force; discontinuous metallic thin films; ferromagnetic materials; magnetic recording; magnetic thin films; magnetisation reversal; platinum alloys; remanence; silicon compounds; tantalum alloys; thermal stability; CoCr-based thin film; CoCrTa; CoPt-SiO2 granular film; CoPt-based thin film; CoPtCr; CoPtSiO2; SiO2; archival characteristics; coercivity; elevated temperatures; high density recording media; magnetic recording media; read/write characteristics; remanence; small activating magnetic moment value; temperature dependence; thermal stability; Anisotropic magnetoresistance; Coercive force; Equations; Frequency; Magnetic anisotropy; Magnetic recording; Magnetization; Perpendicular magnetic anisotropy; Temperature dependence; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
