公开(公告)号：US12106787B1

公开(公告)日：2024-10-01

申请号：US18229096

申请日：2023-08-01

Applicant: Western Digital Technologies, Inc.

Inventor： Yung-Hung Wang ,  Chih-Ching Hu ,  Hongxue Liu ,  Guanxiong Li ,  Chen-Jung Chien ,  Ming Mao ,  Ming Jiang

IPC: G11B5/39

CPC classification number: G11B5/3932

Abstract: The present disclosure generally relate to a read head and methods of forming thereof. Upon forming a dual free layer (DFL) sensor and a rear hard bias (RHB) structure on a seed layer, a photoresist is deposited on the DFL read head and the RHB structure. A refill layer is deposited on the photoresist and the seed layer adjacent to the DFL sensor and the RHB structure. Portions of the refill layer disposed on one or more sidewalls of the photoresist are removed, and a SiOx cap layer is deposited on the refill layer and on the one or more sidewalls. The photoresist is removed, and the SiOx cap layer and top surfaces of the DFL sensor and the RHB structure are planarized to form a substantially flat topography. The SiOx cap layer acts as a stop layer for the refill layer, and remains in the finished read head.

公开(公告)号：US11410690B2

公开(公告)日：2022-08-09

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).