Microwave Assisted Magnetic Recording and Dual Side Spin Torque Oscillator
Prof. Jian-Gang (Jimmy) Zhu
Director of the Data Storage Systems Center at Carnegie Mellon University
Date & Time: 10:00 - 11:10, December 14th (Wed), 2016.
Place: 8F Special Reception Room #801-802, Sengen.
Abstract:
As conventional perpendicular magnetic recording technology approaches its physical limits, increasing area storage density capability of a hard disk drive becomes a challenge. Microwave assisted magnetic recording (MAMR) is one of the main stream alternative technologies for future hard disk drive applications, along with heat assisted magnetic recording (HAMR). In MAMR, a two-terminal spin torque oscillator is embedded in the write-gap of a current recording head, generating high frequency (~ 30GHz) ac magnetic field in the media with a dc current injection. The presence of the very localized high frequency ac magnetic field can significantly enhance the writability, write field gradient, and ultimately the scalability, enabling the area density capability to reach multiple times of what is supported in current hard disk drives. This talk will cover the underlying physical mechanism of the recording in MAMR technology along with micromagnetic simulation-based systematic investigation. Special focus will be placed on the dual side spin transfer spin torque oscillator (STO), a novel scheme that should greatly enhance the efficiency for generating the ac field with sufficient amplitudes compared to conventional spin torque oscillator design.