High moment side shield design for area density improvement of perpendicular magnetic recording (PMR) writer

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9361912
SERIAL NO

14690693

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A PMR writer is disclosed wherein a hot seed layer (HS) made of a 19-24 kilogauss (kG) magnetic material is formed between a side gap and a 10-16 kG magnetic layer in the side shields, and between a 16-19 kG magnetic layer and the leading gap in the leading shield to improve Hy_grad and Hy_grad_x while maintaining write-ability. The HS is from 10 to 100 nm thick and has a first side facing the write pole with a height of ≦0.15 micron, and a second side facing a main pole flared side that may extend to a full side shield height of ≦0.5 micron. First and second sides may form a continuous curve or the a double tapered design where first and second sides have different angles with respect to a center plane. The side shield design described herein is especially beneficial for side gaps of 20-60 nm.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

Patent OwnerAddress
TDK CORPORATION2-5-1 NIHONBASHI CHUO-KU TOKYO 103-6128
HEADWAY TECHNOLOGIES INC682 S HILLVIEW DRIVE MILPITAS CA 95035

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dovek, Moris San Jose, US 102 1695
Lee, Jiun-Ting Sunnyvale, US 32 672
Liu, Xiaomin Fremont, US 38 243
Liu, Yue Fremont, US 330 3286
Nishiyama, Michitaka Tokyo, JP 13 163
Tang, Yuhui Milpitas, US 68 990
Ukita, Hideyuki Tokyo, JP 12 147
Wei, Yaguang Pleasanton, US 41 633
Yamaguchi, Atsushi Tokyo, JP 346 2217

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
7.5 Year Payment $3600.00 $1800.00 $900.00 Dec 7, 2023
11.5 Year Payment $7400.00 $3700.00 $1850.00 Dec 7, 2027
Fee Large entity fee small entity fee micro entity fee
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00