Commissariat a L'energie Atomique

Jean-Baptiste Albertini

Henri Sibuet

Pierre Gaud

G&eacute;rard Barrois

Gerard Barrois

Jean-Claude Peuzin

Mickaël Fievre

Roger Marillat

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 . . .

Method for increasing the operating frequency of a magnetic circuit and corresponding magnetic circuit

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

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.

Method for collective production of magnetic heads having a bearing surface with specific height

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

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.

Assembly for chip(s) with magnetic head(s) and method for making same

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

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.

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Grenoble, France

Jean-Baptiste Albertini