Abstract: A gradient sensor of a component of a magnetic field comprising at least one elementary sensor comprising a deformable mass (31) equipped with a permanent magnet (32) having a magnetization direction substantially colinear to the direction of the gradient of the component of the magnetic field to be acquired by the sensor. The deformable mass (31) is able to deform under the effect of a force exerted on the magnet by the gradient, the effect of this force being to shift it, by dragging the deformable mass (31), in a direction substantially colinear to the component of the magnetic field for which the sensor has to acquire the gradient. The deformable mass (31) is anchored to a fixed support device (33) in at least two anchoring points (36) substantially opposite relative to the mass (31). The elementary sensor also comprises measuring means (35, 35.1, 35.2, 35.3) of at least one electric variable translating deformation or stress of the deformable mass (31) engendered by the gradient.

Abstract: A process for measuring the gradient or an n-th order derivative, in which n is greater than 1, in a direction z, of a component Hx of a magnetic field, the component being invariant, at least locally, in a direction y. The method includes: a) positioning of N (N>n+1) elementary field sensors, each sensor being offset, relative to the neighboring sensors, along y by a distance Ty and along the z axis by a distance ?z, b) measurement of the field by each of the N sensors, and c) calculation of the desired gradient, or the desired nth-order derivative, as a function of the measurements of the field obtained during b).

Abstract: A process for measuring the gradient or an n-th order derivative, in which n is greater than 1, in a direction z, of a component Hx of a magnetic field, the component being invariant, at least locally, in a direction y. The method includes: a) positioning of N (N>n+1) elementary field sensors, each sensor being offset, relative to the neighboring sensors, along y by a distance Ty and along the z axis by a distance ?z, b) measurement of the field by each of the N sensors, and c) calculation of the desired gradient, or the desired nth-order derivative, as a function of the measurements of the field obtained during b).

Abstract: A gradient sensor of a component of a magnetic field comprising at least one elementary sensor comprising a deformable mass (31) equipped with a permanent magnet (32) having a magnetization direction substantially colinear to the direction of the gradient of the component of the magnetic field to be acquired by the sensor. The deformable mass (31) is able to deform under the effect of a force exerted on the magnet by the gradient, the effect of this force being to shift it, by dragging the deformable mass (31), in a direction substantially colinear to the component of the magnetic field for which the sensor has to acquire the gradient. The deformable mass (31) is anchored to a fixed support device (33) in at least two anchoring points (36) substantially opposite relative to the mass (31). The elementary sensor also comprises measuring means (35, 35.1, 35.2, 35.3) of at least one electric variable translating deformation or stress of the deformable mass (31) engendered by the gradient.

Abstract: An integrated circuit includes a first plate-shaped part and at least a plate-shaped second part separate from the first part and attached to the first part by deformable mechanical connection defining a non-zero angle with the first part. A method of producing the integrated circuit includes depositing deformable connecting means in contact with a first portion of the structure and a second portion of the structure, etching the structure to separate the first portion and the second portion, relatively moving the first and second portions to deform the connecting means and fastening together the first portion and the second portion.

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: A process for increasing the frequency of operation of a magnetic circuit. In the process, gaps are formed in at least one section of the magnetic circuit. The gaps lower the permeability of the magnetic circuit and increase in particular the frequency of magnetic resonance and make possible the use of higher frequencies. Applications of the process include the manufacture of inductors, transformers, components, magnetic heads, etc . . .

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: Process for collective production of integrated magnetic heads with a supporting surface with a determined height. According to the invention the components of a board are thinned collectively be etching the board along area overlapping polar parts.

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: A process for increasing the frequency of operation of a magnetic circuit and corresponding magnetic circuit.

Abstract: An assembly including a magnetic head for recording information using a chip based assembly. The assembly includes a chip mounted on a base where a printed circuit with conducting tracks underneath is passed through the base to come into contact with the chips's connection studs. Also disclosed is the process for the manufacture of chip based assemblies.

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 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: Writing or overwriting magnetic head for magneto-optical recording. The head includes a silicon substrate (21) in which is buried a conductor coil (22). The coil (22) is set back with respect to the movement or flight plane (28) of the head. A magnetic circuit (24) can complete the head.