Browse Prior Art Database

Magnetic Bias Means for Magneto-Optic Storage

IP.com Disclosure Number: IPCOM000036464D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Chai, HD: AUTHOR [+3]

Abstract

Disclosed is a means to provide a reversible, negligible heat- dissipation, magnetic bias field for the write and erase process in a magneto-optic information storage device.

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Magnetic Bias Means for Magneto-Optic Storage

Disclosed is a means to provide a reversible, negligible heat- dissipation, magnetic bias field for the write and erase process in a magneto-optic information storage device.

Fig. 1 shows a low-to-medium coercivity cylindrical permanent magnet with a magnetization coil. Other suitable magnet geometries can be used. Applying a pulse current to the magnetization coil magnetizes the magnet parallel to the center line of the magnet. After magnetization, the magnet remains magnetized and provides the bias field. Reversing the pulse current direction magnetizes the magnet in the opposite direction for the write or erase operation, respectively. Power to the magnetization coil is only required to reverse the bias field. Present erasable media magneto-optic drives utilize electromagnetic bias fields which require power as long as the bias field is required 1,2.

Fig. 2 shows the use of the permanent magnet bias field within the magneto- optic storage drive after magnetization.

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References: 1 M. Mansuripur, "Disk Storage: Magneto-Optics Leads the

Way," Photonics Spectra, 59 (October 1984). 2 W. P. Altman, G. M. Clafie and M. L. Levene, "Optical

Storage for High Performance Applications in the Late

1980's and Beyond", RCA Engineer 49, 31-1, 46-55

(January/February 1986).

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