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Recording and Reading Information

IP.com Disclosure Number: IPCOM000093109D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Blanchard, JG: AUTHOR

Abstract

In this data recording system, electron beam 1, left-hand drawing, is used to record data on memory element 2 which has a ferroelectric film or crystal 3 formed on a grounded conductive substrate 5. Before recording, element 2 is subjected to an external electric field to align all domains 6 in the direction of arrows 7. To record data, beam 1 is directed to a selected domain 8 for depositing a charge in region 9 of sufficient strength to create a field for reversing the polarity of the domain 8. A second arrangement in the right-hand drawing operates on the same principle except that insulating layer 10, coated over memory element 3, is struck by beam 1, assumes the space charge 9 and creates an electric field to switch an adjacent domain 8. Readout of the information, i.e.

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Recording and Reading Information

In this data recording system, electron beam 1, left-hand drawing, is used to record data on memory element 2 which has a ferroelectric film or crystal 3 formed on a grounded conductive substrate 5. Before recording, element 2 is subjected to an external electric field to align all domains 6 in the direction of arrows 7. To record data, beam 1 is directed to a selected domain 8 for depositing a charge in region 9 of sufficient strength to create a field for reversing the polarity of the domain 8. A second arrangement in the right-hand drawing operates on the same principle except that insulating layer 10, coated over memory element 3, is struck by beam 1, assumes the space charge 9 and creates an electric field to switch an adjacent domain 8. Readout of the information, i.e., direction of polarization inside 3, is effected by an electron beam scanning medium 8 or 10 and detection of secondary emission deflection or induced conductivity. Nondestructive readout is insured by recording information at a temperature higher than that at which readout is accomplished.

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