Headway Technologies, Incorporated

Haowen Ren

Yuhui Tang

Yue Liu

Wenyu Chen

Shehrin Sayed

Kowang Liu

Moris Musa Dovek

Wenjie Chen

Tetsuya Roppongi

The present embodiments relate to a PMR write-head structure where the spin-orbit torque (SOT) material is in contact with the main pole in the write gap (WG). In addition, with the write shield (WS) electrically isolated from the side shield (SS) in the present designs, the current can be confined in the SOT material near the main pole, and the device resistance can remain within a reasonable range. It can be shown, using simulations, that the main pole switching rise time can be improved by 18˜24% using spin-orbit torque from heavy metals like platinum.

Spin-orbit torque assisted magnetic write head structure for perpendicular magnetic recording

The present embodiments relate to a magnetic write head structure that improves the maximum allowable bias current to maximize the current-assisted areal density capacity (ADC) gain in hard-disk-drive storage device. The write head can include a magnetic main pole (MP) and a trailing shield (TS) made of magnetic material that collects back the magnetic flux and a write gap (WG) between the MP and the TS that is comprised of a non-magnetic electrical conductor. The WG can include a height that is greater than an eTHd height of the HS that can increase an electrical contact area between the HS and MP for a bias current flow. The WG can further include a first part extending an air-bearing surface (ABS) plane of the write head to a top of the eTHd height and a second part extending from the top of the eTHd height.

Recessed write gap material for enhanced bias current injection and maximizing aerial density capacity in perpendicular magnetic recording

The present embodiments can generally provide a magnetic write head structure with optimized gap current distribution to maximize the current-assisted areal density capacity (ADC) gain in hard-disk-drive storage devices. In a first example embodiment, a non-dual-write-shield (nDWS) write head can include a main pole (MP), a trailing shield (TS), and a write gap (WG) disposed between the MP and the TS. The write head can also include a side shield (SS), a leading shield (LS), and a write shield (WS). The write head can include a side gap (SG) between the MP and the SS on both sides of the MP tip, and a leading gap (LG) between the MP and the LS. The write head can also include a coil wrapped around the MP through a PP3 shield that is configured to direct a time-dependent write current to saturate magnetization of the MP.

Optimizing a current distribution in write heads for efficient energy-assisted magnetic recording

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Fremont, CA, United States of America

Haowen Ren