Effect of Rheology and Slip on Lubricant Deformation and Disk-to-Head Transfer During Heat-Assisted Magnetic Recording (HAMR)

被引:13
作者
Sakhalkar, Siddhesh V. [1 ]
Bogy, David B. [1 ]
机构
[1] Univ Calif Berkeley, Dept Mech Engn, Comp Mech Lab, Berkeley, CA 94720 USA
关键词
Hard disk drives; Heat-assisted magnetic recording; Lubricant; Viscoelasticity; Rheology; Slip; Contamination; Smear; LIQUID LUBRICANT; INTERFACES; GAPS; FLOW;
D O I
10.1007/s11249-018-1100-4
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The high-temperature laser heating during heat-assisted magnetic recording (HAMR) causes the media lubricant to deform and transfer to the head via evaporation/condensation. The ability of the lubricant to withstand this writing process and sufficiently recover post-writing is critical for robust read/write performance. Moreover, the media-to-head lubricant transfer causes a continuous deposition of contaminants originating from the media at the head near field transducer, challenging the reliability of HAMR drives. Most previous studies on the effects of laser exposure on lubricant depletion have assumed the lubricant to be a viscous fluid and have modeled its behavior using traditional lubrication theory. However, Perfluoropolyether lubricants are viscoelastic fluids and are expected to exhibit a combination of viscous and elastic behavior at the timescale of HAMR. In this paper, we introduce a modification to the traditional Reynolds lubrication equation using the linear Maxwell constitutive equation and a slip boundary condition. We study the deformation and recovery of the lubricant due to laser heating under the influence of thermocapillary stress and disjoining pressure. Subsequently, we use this modified lubrication equation to develop a model that predicts the media-to-head lubricant transfer during HAMR. This model simultaneously determines the deformation and evaporation of the viscoelastic lubricant film on the disk, the diffusion of the vapor phase lubricant in the air bearing, and the evolution of the condensed lubricant film on the head. We investigate the effect of viscoelasticity, lubricant type (Zdol vs Ztetraol), molecular weight, slip, and disjoining pressure on the lubricant transfer process.
引用
收藏
页数:19
相关论文
共 46 条
[1]   Critical clearance and lubricant instability at the head-disk interface of a disk drive [J].
Ambekar, Rohit P. ;
Bogy, David B. ;
Dai, Qing ;
Marchon, Bruno .
APPLIED PHYSICS LETTERS, 2008, 92 (03)
[2]  
[Anonymous], 2012, THEORY VISCOELASTICI
[3]   A Head Cleaning Procedure for Heat-Assisted Magnetic Recording [J].
Aoyama, Jun ;
Furukawa, Masaru ;
Nishida, Shuji ;
Tasaka, Kenji ;
Matsuda, Kouji ;
Kuroki, Kenji ;
Ikeda, Masaomi .
IEEE TRANSACTIONS ON MAGNETICS, 2017, 53 (11)
[4]   Thin film rupture and polymer flow [J].
Blossey, Ralf .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2008, 10 (34) :5177-5183
[5]   Viscoelasticity and solution viscosity of perfluoropolyether lubricants [J].
Choi, HJ ;
Lim, ST ;
Izumisawa, S ;
Jhon, MS .
TRIBOLOGY INTERNATIONAL, 2005, 38 (6-7) :682-686
[6]   Simulation of Lubricant Recovery After Heat-Assisted Magnetic Recording Writing [J].
Dahl, Joanna Bechtel ;
Bogy, David B. .
TRIBOLOGY LETTERS, 2013, 52 (01) :163-174
[7]   Lubricant Flow and Evaporation Model for Heat-Assisted Magnetic Recording Including Functional End-Group Effects and Thin Film Viscosity [J].
Dahl, Joanna Bechtel ;
Bogy, David B. .
TRIBOLOGY LETTERS, 2013, 52 (01) :27-45
[8]   Study of Perfluoropolyether Lubricant Consumption and Recovery in Heat Assisted Magnetic Recording Using Molecular Dynamics Simulation Method [J].
Dai, Xiangyu ;
Li, Hui ;
Shen, Shengnan ;
Wu, Shijing .
IEEE TRANSACTIONS ON MAGNETICS, 2017, 53 (03)
[9]   Study of Formation and Development of Lubricant Bridge in Head-Disk Interface Using Molecular Dynamic Method [J].
Dai, Xiangyu ;
Zhang, Jingshi ;
Shen, Shengnan ;
Li, Hui ;
Zhai, Tianqi ;
Wu, Shijing ;
Liu, Sheng ;
Du, Hejun .
IEEE TRANSACTIONS ON MAGNETICS, 2017, 53 (03)
[10]  
Fomblin Z., 2002, Derivatives: Product Data Sheet