Method of manufacturing a device comprising a semiconductor body
First Claim
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1. A method of manufacturing a film-deposited magnetic head comprising the steps of:
- a. providing a semiconductor body having a flat major surface, said body having adjacent its flat major surface a semiconductor layer portion of high electrical resistivity,b. introducing into the semiconductor body from its major surface to a depth less than that of the high resistance layer portion doping impurities to a concentration which when incorporated into the semiconductor body substantially reduces its resistivity, the distribution of said introduced impurities and its resultant profile substantially exactly corresponding to the negative of a non-planar profile which it is desired to shape into the body surface, said desired profile including body surface portions at plural levels.c. thereafter subjecting the thus-doped body to a selective electrolytic etching process which operates to remove the doped surface portions of reduced resistivity but not the high resistivity portions until said doped surface portions are substantially entirely removed leaving intact deeper high resistivity portions forming the desired non-planar profile,d. thereafter depositing on the non-planar profiled surface a continuous film of conductive material which extends over the different levels of the non-planar profile, ande. thereafter completing by deposition electrical windings and a gapped magnetic circuit of the magnetic head utilizing the film of conductive material to form conductive elements recessed in some of the deeper areas of the non-planar profile.
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Abstract
The invention relates to a method of manufacturing a device, for example, a magnetic head for recording and playing back information on a magnetisable medium.
In this method, a substrate of semiconductor material is profiled by a selective electrolytic etching process.
Preceding the etching process, the part of the substrate to be removed by said process is formed by a local doping treatment, for example, by diffusion.
The doping treatment may be carried out in several overlapping steps.
29 Citations
5 Claims
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1. A method of manufacturing a film-deposited magnetic head comprising the steps of:
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a. providing a semiconductor body having a flat major surface, said body having adjacent its flat major surface a semiconductor layer portion of high electrical resistivity, b. introducing into the semiconductor body from its major surface to a depth less than that of the high resistance layer portion doping impurities to a concentration which when incorporated into the semiconductor body substantially reduces its resistivity, the distribution of said introduced impurities and its resultant profile substantially exactly corresponding to the negative of a non-planar profile which it is desired to shape into the body surface, said desired profile including body surface portions at plural levels. c. thereafter subjecting the thus-doped body to a selective electrolytic etching process which operates to remove the doped surface portions of reduced resistivity but not the high resistivity portions until said doped surface portions are substantially entirely removed leaving intact deeper high resistivity portions forming the desired non-planar profile, d. thereafter depositing on the non-planar profiled surface a continuous film of conductive material which extends over the different levels of the non-planar profile, and e. thereafter completing by deposition electrical windings and a gapped magnetic circuit of the magnetic head utilizing the film of conductive material to form conductive elements recessed in some of the deeper areas of the non-planar profile. - View Dependent Claims (2, 3, 4, 5)
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Specification