Continuous Fabrication and Perpendicular Recording Characteristics of Co-Cr Magnetic Tape
A new sputtering source (named an SPT target) was modified so as to enable high-rate deposition and continuous fabrication of Co-Cr composite perpendicular recording media. In order to improve the orientation and crystallinity of the Co-Cr layer and the permalloy backlayer, the aperture position was optimized and a magnetic return path plate was added to the target. The Co-Cr tape medium deposited on a 9 m thick polyimide film using this modified sputtering source showed good high-density recording performance.
A new sputtering target for perpendicular media continuous fabrication and resultant properties.
A new sputtering target was proposed for high-rate deposition fabrication of double layer perpendicular media. The target consisted of Permalloy plate walls which were perpendicular to the substrate and worked themselves as a part of the magnetic circuit for plasma confining. Discharge characteristics of the target were very preferable for low-pressure and high-power sputtering at a low discharge voltage. Obtained Permalloy films showed a wider homogeneous thickness region and much stronger adhesion to a polyimide substrate compared with a conventional GT target.
Conserved Quantities of a Class of Nonlinear Difference-Difference Equations
Higher-order conserved quantities of a class of nonlinear difference-difference equations which are related to the discrete-time Toda equation are obtained using the Miura transformations.