Reversible thermo-optical memory structure

Details Reversible thermo-optical memory structure Reversible thermo-optical memory structure

G - Physics

11

B

352/33.3

G11B 7/24 (2006.01) G11B 7/243 (2006.01)

Patent

CA 1164560

ABSTRACT OF THE DISCLOSURE REVERSIBLE MEMORY STRUCTURE WITH THERMO-OPTICAL WRITING AND OPTICAL READING AND PROCESS FOR WRITING AND ERASING SAID STRUCTURE. The invention relates to a reversible memory structure with thermo-optical inscription or writing and optical reading on a moving support. According to the invention, the memory structure deposited on a substrate (1) is constituted by a double layer (2 and 3). A second allay layer (3) at ambient temperature in the martensitic phase is deposited on a first thermally deformable layer (2). A heat pulse creates a deformation in the first layer, which deforms the martensitic alloy layer. A more powerful heat pulse raises the alloy layer to a temperature above its transformation point from the martensitic phase to another crystallo- graphic phase and erases the inscribed deformation. Particular application to optical disks. Figure 4c

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