NDLI: Storing magnetic data

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Storing magnetic data

Content Provider	IEEE Xplore Digital Library
Author	Jones, R.E. Kryder, M.H.
Copyright Year	1988
Description	Magnetic recording data storage innovation and product evolution is arguably higher than it has ever been. For example, the current record in high density recording is 23.8 Gbit/in/sup 2/, which was demonstrated by Seagate Technology. Data is stored by creating a pattern of magnetization in the media using a recording head. Basically, the head is a split ring-shaped core of easily magnetized material wrapped by a few turns of wire. When current flows in the wire, it induces a magnetic flux in the core and a field across the recording gap. Reversing the current's direction changes the direction of the magnetic field. Because the field lines spread out as they bridge the gap, they magnetize the media in a small zone near the gap. Since data is stored as binary digits, a pattern of current reversals can be coded to represent binary digits. For example, "1" might be represented by a magnetization reversal and "0" by the absence of a reversal. Data is read by sensing the fields that arise from the magnetization transition zones in the media. These fields are caused by a concentration of magnetic poles at the ends of each magnetized region. Since these fields point in the opposite direction to the media's magnetization, they are called "demagetizing fields" These fields extend beyond the media's surface. Thus, they can induce responses in a read head if it is brought close to the media.
Starting Page	17
Ending Page	20
Page Count	4
File Size	641450
File Format	PDF
ISSN	02786648
Volume Number	18
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic flux Magnetic recording Magnetization Magnetic heads Magnetic cores Magnetic materials Wire Memory Technological innovation Magnetic fields
Content Type	Text
Resource Type	Article
Subject	Education Strategy and Management Electrical and Electronic Engineering

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