Head disk interface

Thornton, B. H. and Bogy, D. B., "A Parametric Study of Head-Disk Interface Instability Due to Intermolecular Forces, IEEE Trans. Magn., Vol. 40, No. (1), 2004, pp. 337-343. 

Yang, M. C., Study on Nano-Tribology at Head/Disk Interface of Computer Hard Disk Drives," Ph.D. Thesis, Tsinghua University, Beijing, China, 2001. 

Zhao, X., Bhushan, B., andKajdas, C., Lubrication Studies of Head-Disk Interfaces in a Controlled Environment, Part 2 Degradation Mechanisms of Perfluoropolyether Lubricants," Proc. Inst. Mech. Eng., Part J J. Eng. Tribal., Vol. 214, 2000, pp. 547-559. 

Komvopoulos, K., Head-Disk Interface Contact Mechanism for Ultrahigh Density Magnetic Recording, Wear, Vol. 238,... 

As physical structures used in technological applications have been reduced in size, there has been an increasing need to understand the limiting processes of adhesion and to try to minimize them. For example, adhesion due to humidity is known to have a major effect on the durabihty and friction forces experienced at the recording head/disk interface. Microelectromechanical systems (MEMS) are also detrimentally affected by nanoscale adhesion, with their motion being perturbed or prevented. 

Figure 1.53. The bead-spring model may be used to simulate PFPE molecules in head-disk interface (HDI), which couple with slider dynamics via steep pressure and temperature gradients, which appears in HAMR technology [35],...

C. L. Jiaa and Y. M. Liu, Tribological evaluation and analysis of the head/disk interface with perfluoropolyether and Xl-P phosphazene mixed lubricants, Tribol. Lett. 7(1), 11—16 (1999). 

X. Zhao and B. Bhushan, Lubrication studies of head-disk interfaces in a controlled environment Part 1 effects of disk texture lubricant thermal treatment and lubricant additive on the durability of the head-disk interface, P. I. Mech. Eng. 214(J6), 535-546 (2000). 

S.-C. Kang, R. M. Crone, and M. S. Jhon, A new molecular gas lubrication theory suitable for head-disk interface modeling, J. Appl. Phys. 85(8), 5594-5596 (1999). 

P. R. Peck, M. S. Jhon, R. F. Simmons, and T. J. Janstrom, Mathematical modeling of lubrication for the head-disk interface using incompressible fluids, J. Appl. Phys. 75(10), 5747-5749 (1994). 

The application of the cyclophosphazene N3P3(OC6H4F-4) (OC6H4CF3-3)e (n 2 code name X-IP) as a lubricant is well known. Comparative studies of the tribological properties of X-IP and ionic liquids of al-kylimidazolium tetrafluoroborates have shown a preference for the tetrafluo-roborates as lubricants. The interaction of X-IP with a carbon-coated head at the head-disk interface of hard disk magnetic storage systems in the presence of a perfluoropolyether (PFPE) lubricant, has been diseussed. Attention has been paid to the application of a novel lubricant (A20H) which consists of (234) as the major component and small quantities of (235). The new lubricant displays a lower mobility on carbon surfaces than hydroxyl-... 

In addition to the disk, today more than 50% of read-heads have a DLC overcoat deposited on them. Again, DLC is deposited to improve tribological properties at the head-disk interface and to protect the head transducer against corrosion. Already, carbon films deposited on heads are of the order of 30-50 A thick and they will continue to decrease in thickness [1]. Due to the small size of a read-head, it is possible to use ion beam chemical-vapor-deposition (CVD) processes to deposit the films these methods are, in general, much easier to fine-tune and control than sputtering methods. 

Ono K, Chen JS, Bogy DB (1991) Stability analysis of the head-disk interface in a flexible disc drive. ASME J Appl Mech 58 1005-1014... 

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