公开(公告)号：US20210390978A1

公开(公告)日：2021-12-16

申请号：US16899366

申请日：2020-06-11

Applicant: Western Digital Technologies, Inc.

Inventor： Chih-Ching HU ,  Yung-Hung WANG ,  Ming MAO ,  Guanxiong LI ,  Daniele MAURI ,  Xiaoyong LIU ,  Yukimasa OKADA ,  Anup ROY ,  Chen-jung CHIEN ,  Hongxue LIU

IPC: G11B5/39

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).