TY - GEN
T1 - Effect of humidity on the nanoscale heat transfer at the head-media interface
AU - Cheng, Qilong
AU - Ma, Yuan
AU - Bogy, David
N1 - Funding Information:
This research project was supported by Computer Mechanics Laboratory at Department of Mechanical Engineering, UC Berkeley. We thank J-P. Peng from WDC for supplying the components, and Erhard Schreck, Robert Smith, Oscar Ruiz, Sukumar Rajauria from WDC for providing insightful discussion.
Funding Information:
This research project was supported by Computer Mechanics Laboratory at Department of Mechanical Engineering, UC Berkeley. We thank J-P. Peng from WDC for supplying the components, and Erhard Schreck, Robert Smith, Oscar Ruiz, Suku-mar Rajauria from WDC for providing insightful discussion.
Publisher Copyright:
© 2019 ASME.
PY - 2019
Y1 - 2019
N2 - In hard disk drives (HDD), the head-media spacing has decreased to less than 10 nm. Across this nanoscale gap, the heat transfer between the head and media may affect the airbearing design, lubricant transfer and contact issues. Thus, understanding the heat transfer mechanism is very important to magnetic recording, especially for Heat Assisted Magnetic Recording (HAMR). In this paper, the heat transfer between a head and a static media is studied. In particular, the effect of humidity on the nanoscale heat transfer between a head and a static media is studied experimentally. From the transient and steady data of the experiments, it is proposed that the dynamic response of head protrusion is faster than heat dissipation. Also, a layer of water is assumed to form between the head and the media under high humidity. The water-layer affects the spacing and the heat transfer coefficient across the interface. In the near-contact regime, namely when the clearance is less than 2 nm or so, the protrusion interacts with the water-layer on the media, resulting in a lower rate of change of cooling.
AB - In hard disk drives (HDD), the head-media spacing has decreased to less than 10 nm. Across this nanoscale gap, the heat transfer between the head and media may affect the airbearing design, lubricant transfer and contact issues. Thus, understanding the heat transfer mechanism is very important to magnetic recording, especially for Heat Assisted Magnetic Recording (HAMR). In this paper, the heat transfer between a head and a static media is studied. In particular, the effect of humidity on the nanoscale heat transfer between a head and a static media is studied experimentally. From the transient and steady data of the experiments, it is proposed that the dynamic response of head protrusion is faster than heat dissipation. Also, a layer of water is assumed to form between the head and the media under high humidity. The water-layer affects the spacing and the heat transfer coefficient across the interface. In the near-contact regime, namely when the clearance is less than 2 nm or so, the protrusion interacts with the water-layer on the media, resulting in a lower rate of change of cooling.
UR - http://www.scopus.com/inward/record.url?scp=85084099521&partnerID=8YFLogxK
U2 - 10.1115/ISPS2019-7449
DO - 10.1115/ISPS2019-7449
M3 - Conference article published in proceeding or book
AN - SCOPUS:85084099521
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 -