Commissariat a L'energie Atomique

L'etat Francais Represente Par La Delegue General

Didier Challeton

Hubert Moriceau

Bernard Ferrand

Bernard Bechevet

Jacques Daval

Bernard Rolland

Bruno Vallon

Ben J Youssef

Jacques Miltat

Lucile Arnaud

A Bloch line magnetic memory has a magnetic film of thickness h located on a substrate and includes Bloch lines of width .LAMBDA.o. The magnetic film satisfies the condition (1) h/.LAMBDA.o&lt;14 with .LAMBDA.o=.sqroot.A/2.pi.Ms.sup.2, in which A represents the magnetic exchange constant and 4.pi.Ms represents the saturation magnetization of the film.

Bloch line magnetic memory

Method for preparing a magneto optic memory comprising on a support (22), such as one made of glass, metal or a plastic material, a planar sensitive film (21) of magneto optic material for receiving at each point the recording of one of the two binary digits 0 and 1 in the form of small domains juxtaposed and magnetized perpendicular to the plane of the film in one of the two possible directions with respect to the latter, the sensitive film (21) being deposited by a cathodic or other evporation process of a magentic oxide selected from the group including spinel ferrites, hexaferrites and ferrimagnetic garnets, the preceding deposition being followed by a crystallization of the amorphous regions of said film with the aid of an annealing, wherein at least one reflective film (28) and/or one film constituting a thermal screen is inserted between the support (22) and the sensitive film (21) and wherein the annealing is a fast annealing, namely of a few seconds at a temperature of between 600.degree. C. and 650.degree. C.

Method for preparing a magneto optic memory

Process for regulating to desired values the size of the bubbles of magnetic bubble elements during the manufacture of such elements by liquid phase deposition into a non-magnetic substrate of a ferrimagnetic garnet film of formula:

Process for regulating to desired values the dimensions of the bubbles

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St. Egreve, France

Didier Challeton