Method for embodying a magnetic head with two magnetic materials
AssigneeCommissariat a l'Energie Atomique
InventorsJean-Marc Fedeli, Henri Sibuet
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Abstract
A method for forming a magnetic head with two magnetic materials and magnetic heads obtained by this method. According to the present invention, a first magnetic material (72, 74) with slight hardness is electrolytically deposited and a second magnetic material (82, 84) with increased hardness is deposited by any other means, especially by cathodic evaporation. Magnetic heads produced by such a method find application for the reading and storage of information of magnetic media such as disks, tapes, etc.
Claims10
A method of making a thin film magnetic head, comprising the steps of:
- forming a lower magnetic film on a substrate;
- forming an electric coil above the lower magnetic film;
- forming two magnetic contact pads having good magnetic continuity with said lower magnetic film on both sides of said electric coil;
- depositing a non-conducting film over the two magnetic contact pads;
- etching said non-conducting film to said magnetic pads so as to form a caisson with a predetermined height;
- forming a thin non-magnetic spacer in a middle of said caisson;
- depositing a conductive film in said caisson and etching said conductive film so as to leave it at a bottom of said caisson, on both sides of said non-magnetic spacer;
- electrolytically depositing in said caisson, taking said conductive film as an electrode, a first magnetic material having first hardness properties, said electrolytically depositing filling up only a portion of the predetermined height of said caisson;
- filling up the remainder of the predetermined height of said caisson with a second magnetic material having second hardness properties higher than said first hardness properties of said first magnetic material.
A method of making a thin film magnetic head, comprising the steps of:
- forming a lower magnetic film on a substrate;
- forming an electric coil above the lower magnetic film;
- forming two magnetic contact pads having good magnetic continuity with said lower magnetic film on both sides of said electric coil;
- depositing a non-conducting film over the two magnetic contact pads;
- etching said non-conducting film to said magnetic pads so as to form a caisson with a predetermined height;
- forming a thin non-magnetic spacer in a middle of said caisson;
- depositing a conductive film in said caisson;
- etching said conductive film so as to leave it at a bottom of said caisson only on one narrow section situated at a base of said non-magnetic spacer;
- electrolytically depositing in said caisson, taking said conductive film as an electrode, a first magnetic material on both sides of said non-magnetic spacer, said first magnetic material having first hardness properties;
- filling up the remainder of said predetermined height of said caisson with a second magnetic material having second hardness properties higher than said first hardness properties of said first magnetic material.
Dependencies are inferred from the claim text.