Title :
Demonstration of 35 Gbits/in2 in media on glass substrates
Author :
Doerner, Mary ; Bian, Xiaoping ; Madison, Michael ; Tang, Kai ; Peng, Qingzhi ; Polcyn, Adam ; Arnoldussen, Tom ; Toney, Michael F. ; Mirzamaani, Mohammad ; Takano, Kentaro ; Fullerton, Eric ; Margulies, David ; Schabes, Manfred ; Rubin, Kurt ; Pinarbasi,
Author_Institution :
IBM Storage Technol. Div., San Jose, CA, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
A recording density of 35 Gbits/in2 was achieved in longitudinal recording media with high-sensitivity GMR heads. The media displayed excellent thermal stability as a result of a CoPtCrB alloy with high magnetocrystalline anisotropy and relatively narrow grain size distribution. The degree of Co easy-axis orientation in the plane of the μm was greatly improved and the grain size was reduced in the media on glass substrates. Estimates of the switching volume from dynamic coercivity and signal-to-noise measurements are larger than the physical grain size, suggesting that intergranular interactions improve stability. A potential path to further increases in recording density above 35 Gbits/in2 is to use antiferromagnetically coupled magnetic layers in the media
Keywords :
boron alloys; chromium alloys; cobalt alloys; coercive force; grain size; magnetic anisotropy; magnetic recording; magnetic recording noise; magnetic switching; platinum alloys; thermal stability; CoPtCrB; CoPtCrB alloy; GMR head; antiferromagnetically coupled layer; areal density; crystallographic texture; dynamic coercivity; glass substrate; grain size; longitudinal magnetic recording; magnetocrystalline anisotropy; signal-to-noise ratio; switching volume; thermal stability; Anisotropic magnetoresistance; Coercive force; Glass; Grain size; Magnetic anisotropy; Magnetic heads; Perpendicular magnetic anisotropy; Size measurement; Thermal stability; Volume measurement;
Journal_Title :
Magnetics, IEEE Transactions on
