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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.
English (United States)
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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.
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
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