NDLI: Influence of Ar pressure on morphology and recording characteristics of hybrid sputtered magnetic disks

Content Provider	IEEE Xplore Digital Library
Author	Werner, A. Hibst, H. Mannsperger, H.
Copyright Year	1965
Abstract	Hybrid sputtered magnetic disks of the type Cr/Co/sub 80/Ni/sub 20/ and Cr/Co/sub 62.5/Ni/sub 30/Cr/sub 7.5/ on Al/Ni-P substrates were prepared at Ar pressures of 510/sup -4/ to 510/sup -2/ mbar. From low to high Ar pressure, the morphology of the layer system changes drastically from a dense structure to a structure characterized by separated columns. The relative density of the metallic part of the layer decreases by 40 vol.% and the surface of the columns is oxidized by contact with air, creating a high O content of 20 at.% in the Cr layer and 6 at.% in the magnetic layer. As a consequence, the rectangular hysteresis loop, typical for longitudinally magnetized thin films, changes to a shape which is typical for pigmented media. Recording tests give constant values for resolution and D/sub 50/ (20-21.5 kfci). The signal level decreases by 50% with increasing Ar pressure, whereas the S/N ratio is drastically improved from 22 dB to 32 dB. The low S/N ratio of layers prepared at low Ar pressure is a consequence of strong exchange interaction between the closely packed magnetic crystallites, which creates high modulation noise. At high Ar pressure these interactions are blocked due to the columnar structure of the layer.<>
Sponsorship	IEEE Magnetics Society
Starting Page	115
Ending Page	117
Page Count	3
File Size	243433
File Format	PDF
ISSN	00189464
Volume Number	26
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Argon Magnetic separation Chromium Magnetic recording Disk recording Surface morphology Magnetic hysteresis Transistors Shape Pigmentation
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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