TY - JOUR
AU1 - Cheng, Qilong
AU2 - Tom, Roshan Mathew
AU3 - Bogy, David B.
AB - Heat-assisted magnetic recording (HAMR), one of the promising hard disk drive technologies to achieve areal density > 10 Tb/in2\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$^2$$\end{document}, integrates a laser across its head-disk interface to assist data writing. However, the laser brings a disk-to-head material transfer problem due to the temperature difference. The thermally-induced material buildup on the head, also known as smear, has been a crucial reliability issue in HAMR, which needs to be addressed before HAMR hard disk drive’s commercialization. In this paper, two mitigation strategies for the material buildup issue are presented: a mechanical approach and a thermal approach. The mechanical approach utilizes the thermal fly-height control heater protrusions to accomplish light head-disk contact to burnish the buildup away due to frictional interactions. The atomic force microscopy images show that the upstream/downstream buildup can be removed by use of dual heaters respectively only within several revolutions. In the thermal approach, the direction of the temperature difference across the head-disk interface is reversed compared to that during the data writing. The results show that the material buildup breaks down into small dots from traces and is mitigated by 91% after a relatively long duration ∼\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\sim$$\end{document} 40 min. Additionally, it is found that a pulsed laser operating at a higher frequency can produce less upstream buildup. This study contributes to the material buildup management in the HAMR head-disk interface, and hence, it is important for the next generation HAMR technology.
TI - Two Strategies to Mitigate Thermally-Induced Material Buildup in Heat-Assisted Magnetic Recording
JF - Tribology Letters
DO - 10.1007/s11249-023-01723-6
DA - 2023-06-01
UR - https://www.deepdyve.com/lp/springer-journals/two-strategies-to-mitigate-thermally-induced-material-buildup-in-heat-RKHdM7lYEw
VL - 71
IS - 2
DP - DeepDyve
ER -