東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Study of Dynamics and Nanoscale Heat...

Ma, Yuan.

Linked to FindBook

Google Book

Amazon

博客來

Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives./
Author:	Ma, Yuan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	104 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-05, Section: B.
Contained By:	Dissertations Abstracts International80-05B.
Subject:	Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10824988
ISBN:	9780438654259

Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives.
Ma, Yuan.

Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 104 p.

Source: Dissertations Abstracts International, Volume: 80-05, Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2018.

This item must not be sold to any third party vendors.

Since its introduction in 1956, hard disk drives have become one of the dominant products in the industry of data storage. The capacity of the hard disk drives must keep evolving to store the exploding data generated in the era of big data. This demand pushes the development of technologies including heat assisted magnetic recording (HAMR), microwave assisted magnetic recording (MAMR) and bit-patterned media (BPM) to increase the areal density beyond 1Tb/in2. In the development of these technologies, it is essential to have a clear understanding of the dynamics and nanoscale heat transfer behavior across the head-disk interface. In this dissertation, dynamics and nano-scale heat transfer in the head disk interface are discussed. Experimental study of nano-scale heat transfer is conducted with the specifically designed static touchdown experiment. Simulation strategy that incorporates the wave-based phonon conduction theory was also developed. In the flying condition, correlation between the temperature and head disk spacing was found at both passive flying stage and modulation stage. When the flying height increases due to either disk surface microwaviness or contact induced modulation, head temperature will increase, with a slight time delay, indicating the existence of a cooling effect as the head approaches the disk. The static touchdown experiment, which decouples the complicated air bearing from the nano-scale interface was further designed and performed. The heat transfer behavior across a closing nano-scale gap between head and disk was observed and measured. Experimental and simulation results showed general agreement with the theoretical predictions of the wave based theory for radiation and phonon conduction. The effect of different factors including humidity, air pressure, lubricant layer and disk substrate in the static touchdown experiment were also studied separately. Furthermore, the dynamics of HAMR condition was studied with waveguide heads. The laser induced protrusion was found to be around 1~2 nm in height. The findings of this dissertation could be applied to future HAMR head/media design, and the static touchdown experiment could be potentially improved to be a new approach to measure material conduction coefficient and emissivity with high special resolution.

ISBN: 9780438654259Subjects--Topical Terms:

525881
Mechanics.

Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives.
LDR:03432nmm a2200325 4500 001 2210428
005 20191121124219.5
008 201008s2018 ||||||||||||||||| ||eng d
020 $a 9780438654259
035 $a (MiAaPQ)AAI10824988
035 $a (MiAaPQ)berkeley:18014
035 $a AAI10824988
040 $a MiAaPQ $c MiAaPQ
100 1 $a Ma, Yuan. $3 1019367
245 1 0 $a Study of Dynamics and Nanoscale Heat Transfer of Head Disk Interface in Hard Disk Drives.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 104 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-05, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Bogy, David B.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2018.
506 $a This item must not be sold to any third party vendors.
520 $a Since its introduction in 1956, hard disk drives have become one of the dominant products in the industry of data storage. The capacity of the hard disk drives must keep evolving to store the exploding data generated in the era of big data. This demand pushes the development of technologies including heat assisted magnetic recording (HAMR), microwave assisted magnetic recording (MAMR) and bit-patterned media (BPM) to increase the areal density beyond 1Tb/in2. In the development of these technologies, it is essential to have a clear understanding of the dynamics and nanoscale heat transfer behavior across the head-disk interface. In this dissertation, dynamics and nano-scale heat transfer in the head disk interface are discussed. Experimental study of nano-scale heat transfer is conducted with the specifically designed static touchdown experiment. Simulation strategy that incorporates the wave-based phonon conduction theory was also developed. In the flying condition, correlation between the temperature and head disk spacing was found at both passive flying stage and modulation stage. When the flying height increases due to either disk surface microwaviness or contact induced modulation, head temperature will increase, with a slight time delay, indicating the existence of a cooling effect as the head approaches the disk. The static touchdown experiment, which decouples the complicated air bearing from the nano-scale interface was further designed and performed. The heat transfer behavior across a closing nano-scale gap between head and disk was observed and measured. Experimental and simulation results showed general agreement with the theoretical predictions of the wave based theory for radiation and phonon conduction. The effect of different factors including humidity, air pressure, lubricant layer and disk substrate in the static touchdown experiment were also studied separately. Furthermore, the dynamics of HAMR condition was studied with waveguide heads. The laser induced protrusion was found to be around 1~2 nm in height. The findings of this dissertation could be applied to future HAMR head/media design, and the static touchdown experiment could be potentially improved to be a new approach to measure material conduction coefficient and emissivity with high special resolution.
590 $a School code: 0028.
650 4 $a Mechanics. $3 525881
650 4 $a Physics. $3 516296
690 $a 0346
690 $a 0605
710 2 $a University of California, Berkeley. $b Mechanical Engineering. $3 1043692
773 0 $t Dissertations Abstracts International $g 80-05B.
790 $a 0028
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10824988