Method for the manufacture of planar magnetic heads by making cavities in a non-magnetic wafer

A method for manufacturing magnetic heads with planar structure used for the encoding and reading of magnetic tapes, each of said magnetic heads having a microgap formed between two magnetic poles and facing a gap defined between two wire-wound ferrite cores, comprising the steps of:

• depositing said magnetic poles as thin layers on a first face of a wafer of non-magnetic material;
• hollowing out, in an opposing face of said water, at least one housing cavity in which said wire-wound cores are disposed, so as to obtain a calibrated spacing or a junction between an upper part of said wire-wound cores and said thin layer magnetic poles;
• forming said wire-wound cores at least in pairs, on a common substrate;
• and
• wire-wounding said cores before inserting said cores in batches in said housing cavities.

A method for manufacturing magnetic heads with planar structure used for the encoding and reading of magnetic tapes, each of said magnetic heads having a microgap formed between two magnetic poles and facing a gap defined between two wire-wound ferrite cores, comprising the steps of:

• depositing said magnetic poles as thin layers on a first face of a wafer of non-magnetic material;
• hollowing out, in an opposing face of said wafer substantially at said microgap formed between said two thin layer magnetic poles, and at least one housing cavity, so as to obtain a calibrated spacing or a junction between an upper part of said wire-wound cores and said thin layer magnetic poles;
• and
• depositing a layer of magnetic material on two symmetrical portions of flanks of said cavity to form said pairs of cores associated with said microgap.

A method for manufacturing magnetic heads with planar structure used for the encoding and reading of magnetic tapes, each of said magnetic heads having a microgap formed between two magnetic poles and facing a gap defined between two wire-wound ferrite cores, said method comprising the steps of:

• depositing said magnetic poles as thin layers on a first face of a wafer of non-magnetic material;
• hollowing out, in an opposing face of said water, at least one housing cavity in which said wire-wound cores are disposed, so as to obtain a calibrated spacing or a junction between an upper part of said wire-wound cores and said thin layer magnetic poles;
• and
• at least partially submerging said thin layer poles with said microgap in cavities made in said first face of the wafer made of non-magnetic material.