Three-DOF dynamic model with lubricant contact for thermal fly-height control nanotechnology

Abstract

A three-degree-of-freedom dynamic contact model with friction and lubricant contact is introduced for thermal fly-height control of a near-contact flying slider. The proposed model addresses the issue of contact with a molecularly thin lubricant layer and includes a third degree-of-freedom, roll. Neither lubricant contact nor roll has been accounted for in previous models of the head–disk interface. Roll angle rotations allow for possible contact at other slider features such as the contact pads, which may induce destabilizing moments to the slider motion and lead to unwanted slider–disk contact. While roll is important primarily during operational shock, the inclusion of lubricant contact is found to be an important determinant of the severity of steady contact while lubricant properties are shown to affect the transient properties of the jump-to- and out-of-contact slider behaviour for near- and light-contact operation. The model's validity is examined using available experimental and simulation data that predict flying height gain due to air bearing stiffening as well as significant vibration zones before and after steady-state contact.

Modeling and simulation in tribology across scales: An overview

“…More recently, new areas of tribology have emerged, including nanotribology, i.e. the study of friction, wear and lubrication at the nanoscale as applied, for example, to micro-and nano-electromechanical systems (MEMS/NEMS), e.g., [12,13], and magnetic storage, e.g., [14,15], and biotribology, which deals with human joint prosthetics, dental materials, skin, etc., and ecological aspects of friction, lubrication and wear (tribology of clean energy sources, green lubricants, biomimetic tribology) [2,[16][17][18][19]. Studies of superlubricity, i.e.…”

Study on Influencing Factors of Adhesion Force on Disk Surface

“…The friction behavior of the two contact objects in the microscopic field is very different from the macroscopic condition. The 'point-to-face' contact behavior of the head and the disk surface is caused by its characteristics of reading and writing in the use of hard disk drive [2,3]. In such a small space, the possibility of the interaction and the intermittent contact between the slider and the disk surface increases much as a result of the combined action of air shear stress, air bearing pressure and Van der Waals force.…”