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.
PULSE: a high-repetition-rate linac driver for x-ray FELs
We describe a staged concept for a linac-based freeelectron laser providing coherent tuneable VUV and soft X-ray output with pulse lengths down to 10 fs or less. Use of 1.3 GHz cryomodules operated with CW RF will allow flexible pulse patterns at potentially very high repetition rates up to 1 MHz. We consider the options for FELs that may be included in a facility of this type.