公开(公告)号：US12131759B2

公开(公告)日：2024-10-29

申请号：US18226609

申请日：2023-07-26

Applicant: Western Digital Technologies, Inc.

Inventor： Hongquan Jiang ,  Guanxiong Li ,  Ming Mao

IPC: G11B5/39 ,  G11B5/11 ,  G11B5/31 ,  G11B5/596

CPC classification number: G11B5/3948 ,  G11B5/11 ,  G11B5/3163 ,  G11B5/3932 ,  G11B5/59688

Abstract: The present disclosure generally relates to a dual free layer (DFL) two dimensional magnetic recording (TDMR) read head, and a method of forming thereof. The read head comprises a lower sensor, middle shields disposed on the lower sensor, and an upper sensor disposed on the middle shields. After the lower reader is formed, a dielectric layer is deposited around an outer perimeter of the lower shield. Portions of the dielectric layer are ion milled such that the remaining portions form a substantially flat layer. Another embodiment includes a deposition of a TaOx layer on the dielectric layer, where x is a numeral. Portions of the dielectric layer and the TaOx layer are then ion milled such that the remaining portions of the TaOx layer and the dielectric layer collectively form a substantially planar layer. The middle shields are formed over the lower reader and are substantially planar.

公开(公告)号：US11087785B1

公开(公告)日：2021-08-10

申请号：US16915718

申请日：2020-06-29

Applicant: Western Digital Technologies, Inc.

Inventor： Ming Mao ,  Daniele Mauri ,  Chen-Jung Chien ,  Guanxiong Li

IPC: G11B5/39 ,  G11B5/858 ,  G11B5/48 ,  G11B5/60 ,  G11B5/851

Abstract: The present disclosure generally related to read heads having dual free layer (DFL) sensors. The read head has a sensor disposed between two shields. The sensor is a DFL sensor and has a surface at the media facing surface (MFS). Behind the DFL sensor, and away from the MFS, is a rear hard bias (RHB) structure. The RHB structure is disposed between the shields as well. In between the DFL sensor and the RHB structure is insulating material. The RHB is disposed on the insulating material. The RHB includes a RHB seed layer as well as a RHB bulk layer. The RHB seed layer has a thickness of between 26 Angstroms and 35 Angstroms. The RHB seed layer ensures the read head has a strong RHB magnetic field that can be uniformly applied.

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).

公开(公告)号：US10777222B1

公开(公告)日：2020-09-15

申请号：US16792010

申请日：2020-02-14

Applicant: Western Digital Technologies, Inc.

Inventor： Xiaoyong Liu ,  Chih-Ching Hu ,  Daniele Mauri ,  Ming Mao ,  Guanxiong Li ,  Yukimasa Okada ,  Ying Hong

IPC: G11B5/39 ,  G11B5/48 ,  G01R33/09

Abstract: A hybrid read head structure for two-dimensional magnetic recording (TDMR) in a disk drive has two stacked current-perpendicular-to-the plane magnetoresistive (CPP-MR) read heads or sensors substantially aligned with one another in the along-the track direction to enable both sensors to read data from the same data track. The structure is a hybrid structure formed on the disk drive slider with the lower sensor being a dual free layer (DFL) or scissoring type of CPP-MR sensor and the upper sensor being a single free layer (SFL) type of CPP-MR sensor.

公开(公告)号：US09042058B1

公开(公告)日：2015-05-26

申请号：US14097157

申请日：2013-12-04

Applicant: Western Digital Technologies, Inc.

Inventor： Shaoping Li ,  Gerardo A. Bertero ,  Michael L. Mallary ,  Guanxiong Li

IPC: G11B5/39 ,  G11B5/60 ,  G11B5/29

CPC classification number: G11B5/3912 ,  G11B5/3909 ,  G11B5/3932 ,  G11B5/3951 ,  G11B5/3961 ,  G11B5/397 ,  G11B2005/3996

Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The method provides a first read sensor stack and defines a first read sensor in a stripe height direction from the first read sensor stack. The stripe height direction is perpendicular to the ABS. A shield is provided on the first read sensor stack and in a down track direction from the first read sensor stack. A second read sensor stack is provided. The shield is between the first read sensor and the second read sensor stack in the down track direction. Both the first read sensor and the second read sensor are defined from the first read sensor stack and from the second read sensor stack, respectively, in a cross-track direction. The cross-track direction is substantially perpendicular to the down track direction and substantially perpendicular to the stripe height direction.

Abstract translation: 一种方法和系统提供具有空气轴承表面（ABS）的磁换能器。 该方法提供了第一读取传感器堆栈并且定义了来自第一读取传感器堆叠的条带高度方向上的第一读取传感器。 条纹高度方向垂直于ABS。 在第一读取传感器堆叠上并且沿着从第一读取传感器堆叠的下行轨道方向设置屏蔽。 提供了第二个读取传感器堆栈。 屏蔽在下行轨道方向上位于第一读取传感器和第二读取传感器堆叠之间。 第一读取传感器和第二读取传感器分别从第一读取传感器堆叠和第二读取传感器堆栈在交叉轨道方向上定义。 交叉轨道方向基本上垂直于向下轨道方向并且基本上垂直于条带高度方向。