MAMR writer with low resistance MAMR stack

US11049514B2 · kind B2 · utility

Assignee

• Western Digital Technologies, Inc. · US

Inventors

• Michael Kuok San Ho · Redwood City, US
• Yunfei Ding · Milpitas, US
• Zhigang Bai · Milpitas, US
• Yaguang Wei · Pleasanton, US
• Terence Lam · Cupertino, US
• Goncalo Marcos BAIÃO DE ALBUQUERQUE · San Jose, US
• Xinjiang Shen · Fremont, US
• Feng Q. Liu · San Ramon, US

Key dates

• Filing date: Jul 17, 2020
• Grant date: Jun 29, 2021
• Expiry date: Jul 17, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B2005/0024
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a MAMR stack disposed between the main pole and the trailing shield at the MFS. The MAMR stack includes a seed layer and at least one magnetic layer. The seed layer is fabricated from a thermally conductive material having electrical resistivity lower than that of the main pole. The seed layer has a stripe height greater than a stripe height of the at least one magnetic layer. With the extended seed layer, the bias current from the trailing shield to the main pole spreads further away from the MFS along the extended seed layer before flowing into the main pole, reducing temperature rise at or near the MAMR stack, leading to improved write head reliability.