Demonstration of 35 Gbits/in/sup 2/ in media on glass substrates
- Resource Type
- Periodical
- Authors
- Doerner, M.; Xiaoping Bian; Madison, M.; Kai Tang; Qingzhi Peng; Polcyn, A.; Arnoldussen, T.; Toney, M.F.; Mirzamaani, M.; Takano, K.; Fullerton, E.; Margulies, D.; Schabes, M.; Rubin, K.; Pinarbasi, M.; Yuan, S.; Parker, M.; Weller, D.
- Source
- IEEE Transactions on Magnetics IEEE Trans. Magn. Magnetics, IEEE Transactions on. 37(2):1052-1058 Mar, 2001
- Subject
- Fields, Waves and Electromagnetics
Grain size
Magnetic anisotropy
Perpendicular magnetic anisotropy
Magnetic heads
Thermal stability
Anisotropic magnetoresistance
Glass
Coercive force
Volume measurement
Size measurement
- Language
- ISSN
- 0018-9464
1941-0069
A recording density of 35 Gbits/in/sup 2/ 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 /spl mu/m 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/in/sup 2/ is to use antiferromagnetically coupled magnetic layers in the media.