NDLI: RF-sputtered chromium-cobalt films for high-density longitudinal magnetic recording

Content Provider	IEEE Xplore Digital Library
Author	Maloney, W.
Copyright Year	1965
Abstract	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, P50is reduced to 66% at comparable output voltage, signal-to-noise ratio is increased, and harmonic falloff is reduced compared to standard particulate disks.
Sponsorship	IEEE Magnetics Society
Starting Page	1546
Ending Page	1548
Page Count	3
File Size	414750
File Format	PDF
ISSN	00189464
Volume Number	15
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1979-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic films Magnetic recording Sputtering Chromium Protection Magnetic properties Digital recording Aluminum Cobalt Disk recording
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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