TY - GEN
T1 - Numerical and experimental investigation of nanoscale heat transfer in the head-media interface during static touchdown
AU - Sakhalkar, Siddhesh V.
AU - Cheng, Qilong
AU - Ma, Yuan
AU - Ghafari, Amin
AU - Bogy, David B.
N1 - Funding Information:
This project was supported by the Computer Mechanics Laboratory at UC Berkeley. We thank JP Peng and Robert Smith of WD for supplying components and helpful discussions.
Publisher Copyright:
© 2019 ASME.
PY - 2019
Y1 - 2019
N2 - With minimum fly height of less than 10 nm in contemporary hard-disk drives, understanding nanoscale heat transfer at the head-media interface is crucial for developing reliable head and media designs. Particularly, with the emergence of Heat-Assisted Magnetic Recording (HAMR) and Microwave-Assisted Magnetic Recording (MAMR), head failure due to overheating has become an increasing concern. There is a need to develop a methodology to use theoretical curves for spacing-dependent nanoscale heat transfer coefficient to predict head and media temperatures in actual hard disk drives. In this study, we present a numerical model to simulate the head and media temperature profiles during static touchdown and compare our results with experiments performed with a magnetic head on a silicon wafer. As the head approaches touchdown with increasing TFC power, the phonon conduction heat transfer coefficient between the head and the substrate increases exponentially, causing a drop in the head temperature vs TFC power curve. Our model shows that the introduction of van der Waals forces between the head and the substrate causes a steeper drop in the head temperature curve and ensures a good quantitative match with experimental results.
AB - With minimum fly height of less than 10 nm in contemporary hard-disk drives, understanding nanoscale heat transfer at the head-media interface is crucial for developing reliable head and media designs. Particularly, with the emergence of Heat-Assisted Magnetic Recording (HAMR) and Microwave-Assisted Magnetic Recording (MAMR), head failure due to overheating has become an increasing concern. There is a need to develop a methodology to use theoretical curves for spacing-dependent nanoscale heat transfer coefficient to predict head and media temperatures in actual hard disk drives. In this study, we present a numerical model to simulate the head and media temperature profiles during static touchdown and compare our results with experiments performed with a magnetic head on a silicon wafer. As the head approaches touchdown with increasing TFC power, the phonon conduction heat transfer coefficient between the head and the substrate increases exponentially, causing a drop in the head temperature vs TFC power curve. Our model shows that the introduction of van der Waals forces between the head and the substrate causes a steeper drop in the head temperature curve and ensures a good quantitative match with experimental results.
UR - http://www.scopus.com/inward/record.url?scp=85084098276&partnerID=8YFLogxK
U2 - 10.1115/ISPS2019-7448
DO - 10.1115/ISPS2019-7448
M3 - Conference article published in proceeding or book
AN - SCOPUS:85084098276
T3 - ASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
BT - ASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2019 28th Conference on Information Storage and Processing Systems, ISPS 2019
Y2 - 27 June 2019 through 28 June 2019
ER -