Heat assisted magnetic recording (HAMR) promises to deliver higher storage areal density than the current perpendicular magnetic recording (PMR) product. A laser is introduced to the HAMR system to heat the high coercively magnetic media above the Curie temperature (Tc) which is as high as 750 K in order to enable magnetic writing. The thermal response of the media becomes very critical for the success of the data writing process. In this paper, a new method is proposed to understand the transient thermal behavior of the HAMR media. The temperature response of the media is measured based on thermal erasure of the magnetically written signal. A lumped model is built to simplify the heat conduction problem to understand the transient thermal response. Finite element modeling (FEM) is implemented to simulate the transient thermal response of the media due to the laser pulse heating. The experimental and simulation results show fairly good agreement.
- Information Storage and Processing Systems Division
Transient Thermal Response of the Media by Free Space Laser Heating in Heat Assisted Magnetic Recording
Xiong, S, Smith, R, Wang, N, Li, D, Schreck, E, Canchi, S, & Dai, Q. "Transient Thermal Response of the Media by Free Space Laser Heating in Heat Assisted Magnetic Recording." Proceedings of the ASME 2016 Conference on Information Storage and Processing Systems. ASME 2016 Conference on Information Storage and Processing Systems. Santa Clara, California, USA. June 20–21, 2016. V001T01A006. ASME. https://doi.org/10.1115/ISPS2016-9528
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