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:
Jun. 15, 2004
Filed:
Jan. 08, 2002
Arshad Alfoqaha, San Jose, CA (US);
Mohamad T. Krounbi, San Jose, CA (US);
Sandrawattie Sankar, San Diego, CA (US);
David J. Seagle, Morgan Hill, CA (US);
Kenneth R. Young, San Jose, CA (US);
Western Digital (Fremont), Inc., Fremont, CA (US);
Abstract
An inductive transducer has inorganic nonferromagnetic material disposed in an apex region adjacent to a submicron nonferromagnetic gap in a magnetic core. The inorganic nonferromagnetic material has a much lower coefficient of thermal expansion than that of hardbaked photoresist, reducing pole tip protrusion even if other insulation surrounding the coil sections within the core is made of hardbaked photoresist. Alternatively, the entire insulation surrounding the coil sections within the core, in addition to the apex region, can be formed of inorganic nonferromagnetic material, further reducing pole tip protrusion. The transducer has SiO rather than alumina in an undercoat layer joining the wafer substrate and the thin film layers of the transducer. SiO may also replace alumina in other areas, such as a piggyback layer joining the inductive transducer with a magnetoresistive transducer.