NDLI: Head-to-media spacing losses in perpendicular recording

Content Provider	IEEE Xplore Digital Library
Author	Iwasaki, S. Speliotis, D. Yamamoto, S.
Copyright Year	1965
Abstract	The perpendicular recording process is essentially demagnetization-free at high bit densities, and the head-to-medium spacing losses become perhaps the most constraining factor in realizing the ultimate capabilities of this technology. In this study we investigated the recording losses resulting from head-to-medium spacing for a double layer madium using a single-pole head and a narrow gap ring head. The spacing was introduced by sputtering Ti overlayers onto the CoCr film in the range of 0.02 microns to 0.18 microns. The recording experiments were performed using a tape deck and a closed tape loop running at low speed. For a spacing d and a wavelength λ, the spacing loss when writing and reading with the single pole head was found to be -99d/λ (dB) for any bit density up to 4Kbpmm (kilo-bits per mm). The spacing losses for the ring head, however, depend on bit density, and are much larger at lower bit densities. In an attempt to separate the writing from the reading spacing losses, we recorded with the single pole head and read back with the ring head. The results of this experiment show that the large spacing losses observed with a ring head at the lower bit densities are primarily incurred during the writing process.
Sponsorship	IEEE Magnetics Society
Starting Page	1626
Ending Page	1628
Page Count	3
File Size	337672
File Format	PDF
ISSN	00189464
Volume Number	19
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Perpendicular magnetic recording Magnetic heads Writing Sputtering Magnetic films Anisotropic magnetoresistance Saturation magnetization Coercive force Demagnetization Large-scale systems
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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