Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Pierre Gaud

Henri Sibuet

Jean-Baptiste Albertini

Jérôme Delamare

Claire Divoux

Christine Louis

Michel Di Gioia

Nathalie Vallet

Jean-Marc Fedeli

Bernard Bechevet

Denis Duret

Robert Cuchet

Veronique Sousa

Gerard Barrois

Véronique Sousa

G&eacute;rard Barrois

Alain Persico

Brigitte Desloges

Line R Vieux

Frédéric Lepoitevin

Mickaël Fievre

The storage medium comprises an array of memory cells () which can be addressed by first () and second () conductors. Each memory cell () comprises one zone () of an active layer () which is initially electrically insulating and which can be made electrically conductive by means of localized plastic deformation (), such as to selectively connect the first () and second () associated conductors. Binary information stored in the memory cell () is determined by the electrical conducting state of the corresponding zone () of the active layer (). The active layer () can be formed using a charged resin. The medium production method comprises assembly of a blank storage medium having an active layer () which is in the initial insulating state, production of a stamping die having a stamping pattern that corresponds to the information to be stored, and stamping of the storage medium using the stamping die.

Plastically deformable irreversible storage medium and method of producing one such medium

An actuator is described having two fixed magnetic structures, and a mobile magnetic part able to move towards either one of the two ends of the magnetic structures. The actuator can be in the form of a microactuator, and can be used in the fabrication of microrelays, microvalves, and micropumps.

Bistable magnetic actuator

An integrated magnetic head including a thin layer structure. The thin layer structure contains, in the edge of the structure constituting the reading and/or writing face of the magnetic head, two pole pieces separated by a gap and aligned longitudinally. The pole pieces are contained in the transverse direction with respect to the structure between parallel planes of the thin layer structure. The magnetic head bas two layers of wear-resistant material which frame the thin layer structure to reinforce the wear resistance of the reading and/or writing face.

Integrated magnetic head comprising a thin layer structure

Magnetic actuator having a closed magnetic circuit () capable of guiding a magnetic flux. The magnetic circuit () comprises a fixed magnetic part () with a yoke () and a mobile part (), magnetically connected to each other and also at least one main air gap () delimited by at least one portion () of the mobile part () and by the yoke (). In the main air gap (), the flux is closed by being set up approximately transverse to the mobile part (). The fixed part () also comprises flux recuperation means () that contribute with the mobile part () to delimiting an auxiliary air gap () in which the magnetic flux is set up laterally to the mobile part (). The flux is contained on each side of the main air gap (), on one side by the yoke (), and on the other side jointly by the mobile part () and the flux recuperation means () through the part () contributing to delimiting the main air gap (). The auxiliary air gap () has a dimension in the direction in which magnetic flux is set up that is minimum in at least one area of the portion () contributing to delimiting the main air gap ().

Magnetic actuator with short response time

A fluxgate micro-magnetometer with perpendicular detection and a process of realization thereof. A ferromagnetic core is perpendicular to a substrate. The axes of excitation coils and pick-up coils are also perpendicular to the substrate. A magnetic field component which is perpendicular to the substrate is thus measured. The two other components can be measured by magnetometers of classical type whose core is parallel to the substrate. Such a device may find application in the domain of magnetic measurement, as an example.

Perpendicular detection fluxgate micromagnetometer and method for the production thereof

A process for collectively making integrated magnetic heads with a bearing surface obtained by photolithography. According to the process, on a wafer is deposited a plurality of heads, a mask defining the profile of the bearing surfaces and the wafer is collectively engraved in the vicinity of the pole pieces of the heads. Such a process may find particular application to the making of magnetic heads.

Method for collective production of magnetic heads with rounded bearing surface

Magnetic head for use in magnetic recording and including an integrated coil having at least one winding around a non-embedded part of the magnetic circuit. The winding includes a lower sheet of conductors placed in a chamber etched in the substrate and which is integrated into this substrate. The magnetic head is manufactured in a process including forming on a solid substrate a magnetic circuit with a first and second polar part having embedded portions positioned side by side and separated by a nonmagnetic air gap. The magnetic circuit includes at least one non-embedded bridging part no portion of which is embedded in the substrate. A conductor coil is formed around the non-embedded part of the circuit by making a lower sheet of conductors passing underneath the non-embedded bridging part and by embedding the lower sheet in at least one chamber made in the substrate, and by making an upper sheet of conductors astride the non-embedded bridging part of the magnetic circuit.

Vertical magnetic head having a magnetic circuit with a non-embedded part and having an integrated coil surrounding the non-embedded part

Process for producing an assembly having several magnetic heads and multiple head assembly obtained by this process

A process for producing a vertical magnetic head for reading information from a magnetic media. The head includes a substrate on which is mounted an amagnetic spacer extending perpendicular to the face of the substrate. A first magnetic material is deposited in vapor phase thin film formed on either side of the spacer. A second magnetic material is deposited on the first by electrolytic growth.

Process for producing a vertical magnetic head

Vertical magnetic head having a magnetic circuit with a non-embedded

A vertically arranged magnetic head for reading information from magnetic media. The head includes a substrate on which is mounted an amagnetic spacer extending perpendicular to the face of the substrate. Two magnetic materials are deposited on the sides of the spacer, the first being deposited by a vapor phase and the second being deposited on the first by electrolytic growth.

Vertical magnetic head having first and second magnetic materials in

A process for producing a double magnetic head with two head gaps with opposite azimuths by forming a first magnetic head with a first head gap having a predetermined inclination angle on a first substrate and a second magnetic head having a second head gap with a second inclination angle on a second substrate and etching a first recess along the first head. The second head is received in the first recess and a second recess is etched along the second head to receive the first head. Subsequently, one of the heads is reversed and the first head is fitted into the second recess and the second head into the first recess so that the first and second inclination angles are opposed in a common reference frame thereby providing opposite azimuth angles.

Processes for producing a double magnetic head having head gaps with

A process for a production of a vertical magnetic head. With this process of producing a vertical magnetic head, a magnetic spacer defining a head gap is formed. This magnetic spacer is formed from a same material as a substrate of the vertical magnetic head. Such a vertical magnetic head has particular application to magnetic recording and reproducing.

Process for the production of a vertical magnetic head

Vertical magnetic head with an integrated coil and its production process wherein the head comprises two pole pieces (30.sub.2, 30.sub.2) and two integrated coils 50.sub.1, 50.sub.2), which are interconnected by a conductor bridge (75). A magnetic or permeability bridge (70) connects the two pole pieces and closes the circuit.

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Coublevie, France

Pierre Gaud