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

US10311899B2 · kind B2 · utility

Assignee

• Headway Technologies, Inc. · US

Inventors

• Yue Liu · Plymouth, US
• Ying Liu · San Jose, US
• Yuhui Tang · Milpitas, US
• Jiun-Ting Lee · Sunnyvale, US
• Moris Dovek · San Jose, US
• Yiming Wang · Beijing, CN

Key dates

• Filing date: May 25, 2018
• Grant date: Jun 4, 2019
• Expiry date: May 25, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/3912
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

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 α of ≥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.