Method of manufacturing magnetic write/read head and fabrication method
AssigneeThomson-CSF
InventorsJean-Paul Castera, Jean-Marc Coutellier
Life of this patent
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Abstract
Disclosed is a magnetic head comprising chiefly two thin or thick layers of magnetic materials located in a same plane and separated by a gap layer of non-magnetic material, also made in the form of a thin or thick layer. This gap layer forms a determined angle with the plane of the layers of magnetic materials. Methods are also provided for the making of such a head. In particular, these methods make it possible to determine, with precision, the angle of the gap with the plane of the layers of magnetic materials. Applications: magnetic write/read heads for computer peripherals (using tapes or disks), and possibly video tape recorders.
Claims22
A method for making a magnetic write/read head comprising:
- (a) providing a monocrystalline substrate having a main face oriented along a predetermined angle with respect to a crystallographic axis of the monocrystalline substrate;
- (b) forming a mask on apart o the main face;
- (c) selectively chemically attacking the main face of the mono crystalline substrate;
- (d) depositing a gap layer of a non-magnetic material on at least a portion of the substrate subjected to chemical attack;
- (e) depositing a first layer of a magnetic material on said gap layer;
- (f) machining the first layer of a magnetic material to form a substantially planar surface;
- (g) bonding a first support layer of a non-magnetic material to the substantially planar surface;
- (h) removing remaining portions of said monocrystalline substrate;
- (i) depositing a second layer of a magnetic material on a face left free after removal of the monocrystalline substrate;
- and
- (j) drilling a hole through said first support layer, said first and second layers of magnetic materials and said gap layer at a location where said first and second layers of magnetic materials are separated by said gap layer such that an interruption if formed in said gap layer;
- wherein a magnetic write/read head is provided having first and second layers of magnetic materials extending along the first support layer and separated by the gap layer such that an active surface o the magnetic write-read head includes thickness dimensions of said first and second layers of magnetic materials.
The method for making a magnetic write/read head comprising:
- (a) providing a monocrystalline substrate having a main face oriented along a determined angle with respect to a crystallographic axis of the monocrystalline substrate;
- (b) forming a mask on a part of the main face o the substrate;
- (c) selectively chemically attacking said main face of the monocrystalline substrate;
- (d) depositing a first layer of a magnetic material on at lest a potion of the substrate which was subjected to chemical attack;
- (e) depositing a gap layer of a non-magnetic material on said first layer of magnetic material;
- (f) depositing a second layer of a magnetic material on said gap layer;
- (g) machining said second layer of magnetic material to form a substantially planar surface;
- (h) bonding a first support layer o the substantially planar surface;
- (i) removing the monocrystalline substrate;
- (j) drilling a hole through said first and second layers of magnetic materials and said gap layer at a location where said first and second layers are separated by said gap layer such that an interruption is formed in said gap layer;
- wherein a magnetic write/read head is provided having two layers of magnetic materials extending along said first support layer and separated by a gap layer such that an active surface of the magnetic head includes thickness dimensions of said two layers of magnetic material.
Dependencies are inferred from the claim text.