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. 21, 2014
Filed:
Oct. 28, 2010
Satoru Araki, San Jose, CA (US);
Hardayal S. Gill, Palo Alto, CA (US);
Hiroaki Chihaya, Odawara, JP;
Dustin W. Erickson, Morgan Hill, CA (US);
Haiwen Xi, San Jose, CA (US);
Chang Man Park, Los Altos, CA (US);
Satoru Araki, San Jose, CA (US);
Hardayal S. Gill, Palo Alto, CA (US);
Hiroaki Chihaya, Odawara, JP;
Dustin W. Erickson, Morgan Hill, CA (US);
Haiwen Xi, San Jose, CA (US);
Chang Man Park, Los Altos, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A magnetic read sensor having improved robustness to withstand thermal variations resulting from thermal fly height heating. Improved thermal robustness comes as a result of improved pinned layer pinning. The read head includes an AFM layer having an increased thickness to provide a higher blocking temperature. The read head further includes a pinned layer structure that includes a first magnetic layer adjacent to and exchange coupled with the AFM layer. The first layer comprises a Co—Fe layer with an increased Fe content of 20-30 atomic percent. The pinned layer structure also includes a second magnetic layer that is antiparallel coupled with the AP1 layer. The AP2 layer can be a multi-layer structure that includes a layer of CoFe, a layer of Co—Fe—Hf formed on the layer of Co—Fe, a layer of Co—Fe—B formed on the layer of Co—Fe—Hf, and a second layer of Co—Fe formed on the layer of Co—Fe—B.