R&D: Experimental Study of Media Heat Sink Thickness Impact on Signal-to-Noise Ratio in HAMR
Thicker HS is trade-off between background interference and thermal gradient, thus thermal media design remains challenging to achieve ultra-high areal density.
This is a Press Release edited by StorageNewsletter.com on November 19, 2019 at 2:35 pmJapanese Journal of Applied Physics has published an article written by Somyot Kaitwanidvilai, Department of Electrical Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand, Nuttapon Chaiduangsri, Department of Electrical Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand, and Damrongsak Tongsomporn, Seagate Technology Thailand Ltd, Samut Prakan, Thailand.
Abstract: “Recently, Heat assisted magnetic recording (HAMR) has been demonstrated to extend the areal density growth overcome the superparamagnetic limited. One key component of this technology is a heat sink layer in HAMR media, which benefit the thermal gradient and transition noise. However, the disadvantage of the heat sink layer (HS) is not fully explored. In this paper, we investigate the background interference impact due to the heat sink layer via the spin-stand tester. HAMR heads included a light delivery system have measured a signal to noise ratio and down-track thermal gradient on a variety of HS thickness (20, 50, and 110nm). Finally, we found that thicker HS is a trade-off between the background interference and thermal gradient. Thus the thermal media design remain challenging to achieve an ultra-high areal density.“
Subscribe to our free daily newsletter
