The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 1998
Filed:
Jun. 10, 1996
NEC Corporation, Tokyo, JP;
Abstract
A thin film magnetic head includes lower and upper magnetic cores, an upper magnetic core distal end portion, a magnetic gap layer, coil layers, and insulating layers. The lower magnetic core has a distal end portion facing a magnetic head floating surface. The upper magnetic core distal end portion opposes the distal end portion of the lower magnetic core through a magnetic gap. The lower magnetic core and the upper magnetic head distal end portion are heated at a temperature T1 to have a saturation magnetic flux density BS1. The upper magnetic core magnetically connects the lower magnetic core and the upper magnetic core distal end portion to constitute a magnetic core and is heated at a temperature T2 to have a saturation magnetic flux density BS2. Note that T2<T1 and BS2<BS1. The nonmagnetic layer is formed between the lower and upper magnetic cores to constitute the magnetic gap. The coil layers are formed between the upper magnetic core and the nonmagnetic layer to excite the lower and upper magnetic cores. The insulating layers insulate the coil layers from each other and the coil layers and the upper magnetic core from each other. A method of manufacturing a thin film magnetic head, and a magnetic recording apparatus are also disclosed.