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Switching Behavior and Writeability in Perpendicular Magnetic Dual Oxide Media With Capping Layer.
- Source :
- IEEE Transactions on Magnetics; Jun2010, Vol. 46 Issue 6, p1802-1805, 4p
- Publication Year :
- 2010
-
Abstract
- We report a systematic study of the switching behavior and writeability characteristics of perpendicular magnetic recording media in which the anisotropy (K<subscript>u</subscript>) of granular oxides, magnetic volume (M<subscript>5</subscript> · t, product of magnetization and thickness) of cap layer, and exchange coupling between granular oxide and cap layer were varied. The media switching behavior highly depends on the M<subscript>5</subscript>t of cap layer as well as the oxide-to-cap exchange coupling strength but little on the K<subscript>u</subscript> of granular oxides. The media switching field H<subscript>o</subscript> at 1-ns scales is strongly affected by switching mode and is greatly reduced with incoherent switching mode. At constant switching mode with fixed M<subscript>5</subscript>t of cap layer, the media writeability is primarily determined by the oxide K<subscript>u</subscript> value that affects the H<subscript>o</subscript>. However, when the switching mode varies with different cap M<subscript>5</subscript>t or oxide-to-cap exchange coupling strength, no correlation between H<subscript>o</subscript> and writeability is observed. Higher K<subscript>u</subscript> oxide media with higher M<subscript>5</subscript>t of cap layer exhibits lower H<subscript>o</subscript> due to more incoherent switching but substantially lower overwrite (OW) than the lower K<subscript>u</subscript> oxide media with lower M<subscript>5</subscript>t of cap. Similarly, media with weaker exchange-coupling between oxide and cap layers shows more incoherent switching mode and worse writeability even with lower H<subscript>o</subscript>. Our results have shown that oxide-to-cap exchange coupling as well as oxide K<subscript>u</subscript> is critical in media design for good writeability at high recording density and can be optimized through selection of appropriate oxide and cap materials. [ABSTRACT FROM AUTHOR]
- Subjects :
- GRANULAR materials
MAGNETICS
OXIDES
FERROMAGNETISM
ANISOTROPY
Subjects
Details
- Language :
- English
- ISSN :
- 00189464
- Volume :
- 46
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Magnetics
- Publication Type :
- Academic Journal
- Accession number :
- 51117554
- Full Text :
- https://doi.org/10.1109/TMAG.2009.2038928