Headway Technologies, Incorporated

Yiming Wang

Moris Musa Dovek

Yuhui Tang

Yue Liu

Xuhui Jin

Ying Liu

Tobias Maletzky

Joe Smyth

Jiun-Ting Lee

Dayu Zhou

Cherng-Chyi Han

Yoshihiro Tsuchiya

Tsutomu Chou

Shinji Hara

Weihao Xu

Kouji Shimazawa

Sanghyun Lim

A method of forming a PMR writer with an all wrap around (AWA) shield design in which one or more of the leading shield, side shields, and trailing shield (TS) structure (except the hot seed layer) at the air bearing surface (ABS) are comprised of an alloy having a damping parameter &#x3b1; of &#x2265;0.04 to minimize wide area track erasure (WATE). The TS structure comprises two outer magnetic layers with an 8-16 kiloGauss (kG) saturation magnetic moment (Ms) on each side of a center stack with a lower write gap, a middle hot seed layer (Ms of 19-24 kG), and an upper magnetic layer (Ms of 16-24 kG). The hot seed layer and upper TS magnetic layer promote improved area density capability (ADC). A second TS layer with Ms of 16-24 kG and a full width at the ABS may be formed on the upper magnetic layer.

Method of forming write head designs with sandwich trailing shield (STS) for high data rate perpendicular recording

A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, side shields, and trailing shield (TS) structure (except the hot seed layer) at the air bearing surface (ABS) are comprised of an alloy having a damping parameter &#x3b1; of &#x2265;0.04 to minimize wide area track erasure (WATE). The TS structure comprises two outer magnetic layers with an 8-16 kiloGauss (kG) saturation magnetic moment (Ms) on each side of a center stack with a lower write gap, a middle hot seed layer (Ms of 19-24 kG), and an upper magnetic layer (Ms of 16-24 kG). The hot seed layer, and upper TS magnetic layer promote improved area density capability (ADC). A second TS layer with Ms of 16-24 kG and a full width at the ABS may be formed on the upper magnetic layer.

Write head designs with sandwich trailing shield (STS) for high data rate perpendicular recording

A method for manufacturing a TAMR (thermal assisted magnetic recording) write head. The write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.

Method for manufacturing thermally-assisted magnetic recording head with waveguide blocker

A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, side shields, and trailing shield (TS) structure (except the hot seed layer) at the air bearing surface (ABS) are comprised of an alloy having a damping parameter &#x3b1; of &#x2265;0.04 to minimize wide area track erasure (WATE). The TS structure comprises two outer magnetic layers with an 8-16 kiloGauss (kG) saturation magnetic moment on each side of a center stack with a lower write gap, a middle hot seed layer having a 19-24 kG saturation magnetic moment, and an upper magnetic layer with a 16-24 kG saturation magnetic moment, and each having a first cross-track width. The hot seed layer, upper TS magnetic layer and an overlying PP3 trailing shield promote improved area density capability (ADC).

A TAMR (thermal assisted magnetic recording) write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.

Plasmon generator with metallic waveguide blocker for TAMR

Bits per inch (BPI) is increased, and faster risetime is achieved while adjacent track erasure (ATE) is maintained at an acceptable level by inserting a 10-12 kG magnetic (TS0) layer between a 19-24 kG hot seed layer and 16-19 kG magnetic layer in a trailing shield structure at the ABS. A back portion (TY0) of the 10-12 kG magnetic layer is formed in a back gap connection between a back portion of the 16-19 kG magnetic layer and a trailing side of the main pole layer. A front side of the TY0 layer is 1-2 microns from the ABS and thereby improves BPI and writer speed. Accordingly, throat height in the write head may be reduced to less than 500 nm and thereby enables better bit error rate (BER). The TS0 layer is responsible for maintaining clean ATE near a far side of the writer track.

Perpendicular magnetic recording (PMR) write head with multiple layer trailing shield

A perpendicular magnetic recording (PMR) writer is disclosed wherein a hybrid side shield (hSS) has an inner 15-24 kG hot seed layer formed between a gap layer and an outer hSS layer to improve tracks per inch capability while maintaining acceptable adjacent track interference (ATI). The outer hSS layer has a magnetization saturation (Ms) value from 10-19 kG and less than that of the inner hot seed layer. The inner hot seed layer has a far side that is 100 to 500 nm from a center of the main pole and may be coplanar with the sidewalls of an overlying write gap and 19-24 kG trailing shield layer. As a result, the side shield return field is substantially improved over a full side shield made of 12-16 kG material. Meanwhile, the trailing shield return field is substantially the same to enable better area density capability (ADC).

Perpendicular magnetic recording (PMR) write head with hybrid side shield

A method of forming a TAMR (Thermal Assisted Magnetic Recording) write head that uses the energy of optical-laser excited plasmons to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The magnetic field of the write head is enhanced by the formation of a leading shield that is formed in a concave geometrical shape and partially surrounds the waveguide portion of the head within the concavity, which allows the distal end of the waveguide to extend to the ABS plane of the write head. This arrangement reduces the gap between the shield and the magnetic pole and does not interfere with the ability of the waveguide to efficiently transfer its optical energy to the plasmon generator and, ultimately, to the surface of the magnetic recording medium.

Method of forming a TAMR writer with a concave leading shield for enhanced field magnitude

A TAMR (Thermal Assisted Magnetic Recording) write head uses the near field energy of optical-laser excited plasmon eigenmodes in a plasmon resonator to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The plasmon resonator is formed as a conducting disk-shaped structure with an extending peg that serves to further confine the near fields within a small region of the recording medium. The resonator eigenmodes are excited, through direct or evanescent coupling, by an interference pattern formed by the overlap of optical waves within a dual-channel waveguide, the interference pattern being the result of the waves in one branch being phase-shifted relative to the waves in the other branch.

Plasmon resonator with dual waveguide excitation for TAMR

A TAMR (Thermal Assisted Magnetic Recording) write head uses the energy of optical-laser excited plasmons to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The magnetic field of the write head is enhanced by the formation of a leading shield that is formed in a concave geometrical shape and partially surrounds the waveguide portion of the head within the concavity, which allows the distal end of the waveguide to extend to the ABS plane of the write head. This arrangement reduces the gap between the shield and the magnetic pole and does not interfere with the ability of the waveguide to efficiently transfer its optical energy to the plasmon generator and, ultimately, to the surface of the magnetic recording medium.

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San Jose, CA, United States of America

Yiming Wang