RF-SPUTTERED CHROMIUM-COBALT FILMS FOR HIGH-DENSITY LONGITUDINAL MAGNETIC RECORDING

被引:11
作者
MALONEY, WT
机构
[1] Sperry Research Center, Sudbury
关键词
D O I
10.1109/TMAG.1979.1060389
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Layered chromium-cobalt films having the magnetic and physical properties required for high-density digital recording have been deposited by rf sputtering onto small pyrex samples and onto 35.6-cm (14 in) diameter aluminum substrates. The layered structure consists of a layer of chromium several hundred nanometers thick surmounted by a cobalt layer a few tens of nanometers thick. To permit actual recording measurements, disks were protected with rf-sputtered coatings of chromium, carbon or silicon dioxide about 100 nm thick. RF sputtering offers excellent adhesion and good process control and can deposit non-conducting protective layers. Coercivities from 300 to more than 800 Oe and remanence-thickness products from 0.08 to 0.025 G-cm have been achieved at squarenesses in excess of 0.8. Under testing through a Winchester-type interface, P50 is reduced to 66% at comparable output voltage, signal-to-noise ratio is increased, and harmonic falloff is reduced compared to standard particulate disks. © 1979 IEEE
引用
收藏
页码:1546 / 1548
页数:3
相关论文
共 5 条
[1]   ELECTRON MICROSCOPY ON HIGH-COERCIVE-FORCE CO-CR COMPOSITE FILMS [J].
DAVAL, J ;
RANDET, D .
IEEE TRANSACTIONS ON MAGNETICS, 1970, MAG6 (04) :768-&
[2]   EXPERIMENTAL STUDIES USING IN-CONTACT RECORDING ON CHROMIUM-COBALT FILMS [J].
LAZZARI, JP ;
MELNICK, I ;
RANDET, D .
IEEE TRANSACTIONS ON MAGNETICS, 1969, MAG5 (04) :955-&
[3]   THIN EVAPORATED FILMS WITH HIGH COERCIVE FORCE [J].
LAZZARI, JP ;
MELNICK, I ;
RANDET, D .
IEEE TRANSACTIONS ON MAGNETICS, 1967, MAG3 (03) :205-&
[4]  
MALONEY WT, 1979, IEEE T MAGN, V15
[5]   NOISE IN DISK DATA-RECORDING MEDIA [J].
SU, JL ;
WILLIAMS, ML .
IBM JOURNAL OF RESEARCH AND DEVELOPMENT, 1974, 18 (06) :570-575