Abstract: A device for recording on and/or reading from a magnetic medium with magnetic tracks, including plural magnetic heads each including a pair of polar parts separated by an amagnetic head gap with a given azimuth angle. The pairs of polar parts are distributed on fixed supports, the head gaps of the pairs of polar parts on a particular support all having the same azimuth angle. At least two supports include pairs of polar parts with different azimuth angles, each support having a given tilt angle from the magnetic tracks.

Abstract: A recording and/or read device of a magnetic medium with magnetic tracks, including plural magnetic heads each including a pair of polar parts separated by an amagnetic head gap. These pairs of polar parts are grouped on at least one support with a non zero tilt angle between ±90° from the tracks, all head gaps of the pairs of polar parts in the support having the same azimuth angle, between ±90° excluding limits from a direction normal to the support.

Abstract: The storage medium comprises an array of memory cells (3) which can be addressed by first (1) and second (2) conductors. Each memory cell (3) comprises one zone (10) of an active layer (8) which is initially electrically insulating and which can be made electrically conductive by means of localized plastic deformation (4), such as to selectively connect the first (1) and second (2) associated conductors. Binary information stored in the memory cell (3) is determined by the electrical conducting state of the corresponding zone (10) of the active layer (8). The active layer (8) can be formed using a charged resin. The medium production method comprises assembly of a blank storage medium having an active layer (8) 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.

Abstract: The storage medium comprises an array of memory cells (3) which can be addressed by first (1) and second (2) conductors. Each memory cell (3) comprises one zone (10) of an active layer (8) which is initially electrically insulating and which can be made electrically conductive by means of localised plastic deformation (4), such as to selectively connect the first (1) and second (2) associated conductors. Binary information stored in the memory cell (3) is determined by the electrical conducting state of the corresponding zone (10) of the active layer (8). The active layer (8) can be formed using a charged resin. The medium production method comprises assembly of a blank storage medium having an active layer (8) 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.

Abstract: 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.

Abstract: 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.

Abstract: According to the invention, which applies in particular to helicoidal recording on tape, for example an integrated magnetic head comprising a thin layer structure whose portion which forms the reading and/or writing face of the head contains two polar parts (64, 66) separated by a gap (68) and longitudinally aligned, contained, in the direction transversal to the structure between two parallel planes (P1, P2) and in this portion, between the planes, on either side of the parts, at least one wear resistant material (70) is formed.

Abstract: Magnetic actuator having a closed magnetic circuit (26) capable of guiding a magnetic flux. The magnetic circuit (26) comprises a fixed magnetic part (30, 31, 32) with a yoke (30) and a mobile part (22), magnetically connected to each other and also at least one main air gap (29) delimited by at least one portion (28) of the mobile part (22) and by the yoke (30). In the main air gap (29), the flux is closed by being set up approximately transverse to the mobile part (22). The fixed part (30, 31, 32) also comprises flux recuperation means (40) that contribute with the mobile part (22) to delimiting an auxiliary air gap (38) in which the magnetic flux is set up laterally to the mobile part (22). The flux is contained on each side of the main air gap (29), on one side by the yoke (30), and on the other side jointly by the mobile part (22) and the flux recuperation means (40) through the part (28) contributing to delimiting the main air gap (29).

Abstract: Magnetic actuator having a closed magnetic circuit (26) capable of guiding a magnetic flux. The magnetic circuit (26) comprises a fixed magnetic part (30, 31, 32) with a yoke (30) and a mobile part (22), magnetically connected to each other and also at least one main air gap (29) delimited by at least one portion (28) of the mobile part (22) and by the yoke (30). In the main air gap (29), the flux is closed by being set up approximately transverse to the mobile part (22). The fixed part (30, 31, 32) also comprises flux recuperation means (40) that contribute with the mobile part (22) to delimiting an auxiliary air gap (38) in which the magnetic flux is set up laterally to the mobile part (22). The flux is contained on each side of the main air gap (29), on one side by the yoke (30), and on the other side jointly by the mobile part (22) and the flux recuperation means (40) through the part (28) contributing to delimiting the main air gap (29).

Abstract: According to the invention, the actuator comprises two fixed magnetic structures (321, 341) (322, 342), and a mobile magnetic part (36) able to move towards either one of the two ends of the magnetic structures. The actuator is preferably in the form of a microactuator.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to an integrated magnetic head comprising a thin layer structure, the thin layer structure containing, in the edge of the structure constituting the reading and/or writing face of the magnetic head, two pole pieces (47, 49) separated by a gap (46A) 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 has two layers (52, 53) of wear-resistant material which frame the thin layer structure to reinforce the wear resistance of the reading and/or writing face.

Abstract: 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.

Abstract: Process for the production of an assembly having several magnetic heads and multiple head assembly obtained by said process. Production takes place of a first substrate (60) with first pole pieces (621, 622) and a second substrate (70) with second pole pieces (721, 733) and magnetic connectors (741, 742). One of the substrates is reversed and engaged on the other. The second substrate is thinned out so that the two pole pieces (721, 722) and the magnetic connectors (741, 742) are level or almost level. The assembly is completed by forming on the second thinned out substrate, magnetic circuit closing means and conductor coils. Application to the production of multiple magnetic head assemblies.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.