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:
Aug. 09, 2022
Filed:
Jun. 11, 2020
Western Digital Technologies, Inc., San Jose, CA (US);
Chih-Ching Hu, Pleasanton, CA (US);
Yung-Hung Wang, San Jose, CA (US);
Ming Mao, Dublin, CA (US);
Guanxiong Li, Fremont, CA (US);
Daniele Mauri, San Jose, CA (US);
Xiaoyong Liu, San Jose, CA (US);
Yukimasa Okada, Cupertino, CA (US);
Anup Roy, Fremont, CA (US);
Chen-Jung Chien, Mountain View, CA (US);
Hongxue Liu, Fremont, CA (US);
WESTERN DIGITAL TECHNOLOGIES, INC., San Jose, CA (US);
Abstract
The present disclosure generally related to a two dimensional magnetic recording (TDMR) read head having a magnetic tunnel junction (MTJ). Both the upper reader and the lower reader have a dual free layer (DFL) MTJ structure between two shields. A synthetic antiferromagnetic (SAF) soft bias structure bounds the MTJ, and a rear hard bias (RHB) structure is disposed behind the MTJ. The DFL MTJ decreases the distance between the upper and lower reader and hence, improves the area density capacity (ADC). Additionally, the SAF soft bias structures and the rear head bias structure cause the dual free layer MTJ to have a scissor state magnetic moment at the media facing surface (MFS).