MAMR recording head with high-attenuation rear shielding start layer
DE602020056717T2Active Publication Date: 2025-08-13WESTERN DIGITAL TECHNOLOGIES INC
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Patent Information
- Application Number
- DE602020056717
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2019-12-30
- Filing Date
- 2020-03-18
- Publication Date
- 2025-08-13
- Estimated Expiration
- 2040-03-18
AI Technical Summary
Technical Problem
Existing MAMR write heads suffer from high bit-flipping rates and diminished AC field assistance due to oscillations in the free layer, which are not effectively addressed by current technologies.
Method used
Incorporating a high damping trailing shield seed layer doped with a rare earth element, such as CoFeHo, between the spin torque oscillator and the trailing shield, reduces the amplitude of additional AC fields and minimizes bit flipping by lowering the magnetic moment and increasing damping in the TS hot seed layer.
Benefits of technology
The high damping trailing shield seed layer effectively reduces bit flipping and maintains AC field assistance, enabling higher recording density and stability in magnetic recording media.
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