R&D: Laser Current Studies in HAMR
Operating radius increases from inner diameter to outer diameter of disk, laser current increases by approximately 20%.
This is a Press Release edited by StorageNewsletter.com on December 4, 2019 at 2:19 pmThe ASME Digital Collection has published, in ASME 2019 28th Conference on Information Storage and Processing Systems proceedings, an article written by Tan D. Trinh, University of California,San Diego, CA, Sukumar Rajauria, Robert Smith, Erhard Schreck, Qing Dai, Western Digital Corporation, San Jose, CA, and Frank E. Talke, University of California,San Diego, CA.
Abstract: “In heat-assisted magnetic recording (HAMR), optical power from a laser diode mounted on the slider is used to heat up a nanometer scale area on the disk surface to approximately 450°C, facilitating the writing process. Controlling optical power or current that is applied to the laser diode in HAMR is a critical task. In this study, a fully integrated system of HAMR heads and disks is used to study laser current as a function of the magnetic write width (MWW), the operating radius, and the head-disk clearance. Our experimental results show that the laser current is a linear function of the magnetic write width and the head-disk clearance. As the operating radius increases from the inner diameter to the outer diameter of the disk, the laser current increases by approximately 20%.“
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