Dynamic Friction Study on Voltage Assisted Overcoat Wearing Head-Disk Interface

2016 ◽  
Author(s):  
Sukumar Rajauria ◽  
Sripathi Canchi ◽  
Erhard Schreck ◽  
Bruno Marchon ◽  
Qing Dai
Keyword(s):  
Quantitative Analysis ◽  
Strain Gauge ◽  
Dynamic Friction ◽  
Head Disk Interface ◽  
Friction Measurement ◽  
Carbon Overcoat ◽  
Sliding Speed ◽  
Disk Interface ◽  
Positive Voltage ◽  
Friction Study

Voltage assisted wear at the head and the disk interface is investigated with the motive of understanding the head overcoat wear processes. In this work, we report the quantitative analysis of voltage assisted wear on head carbon overcoat at high sliding speed interfaces. We found that voltage assisted TFC head wear acts asymmetrically at the interface with positive voltage leading to high wear. We quantitatively analyzed the interface using a strain gauge based friction measurement.

Overcoat Wear and Dynamic Friction Study at the Head-Disk Interface

2014 ◽  
Author(s):  
Sukumar Rajauria ◽  
Sripathi Canchi ◽  
Erhard Schreck ◽  
Bruno Marchon
Keyword(s):  
Shear Strength ◽  
Friction And Wear ◽  
Physical Contact ◽  
Dynamic Friction ◽  
Head Disk Interface ◽  
Friction Measurement ◽  
Disk Interface ◽  
Wear Process ◽  
The Individual ◽  
Friction Study

The dynamic friction and wear at the head and the disk interface is investigated with the motive of understanding the head overcoat wear process associated with physical contact between the head and the disk. In this work, the results from systematic experiments under overpush conditions are presented. Various regimes of head wear are identified based on the individual wear rate of the participating overcoat layers. A strain gauge based friction measurement is used to extract the friction coefficient and the adhering shear strength between the head and the disk.

Experimental and analytical studies of dynamic friction at the head/disk interface

2000 ◽  
Vol 33 (5-6) ◽  
pp. 343-351 ◽  
Author(s):  
Huan Tang ◽  
Li-Ping Wang ◽  
Jing Gui ◽  
David Kuo
Keyword(s):  
Dynamic Friction ◽  
Head Disk Interface ◽  
Disk Interface ◽  
Analytical Studies

Modeling of Amorphous Carbon Overcoat for Investigation of Lubricant Transfer at the Head-Disk Interface

2014 ◽  
Author(s):  
Young Woo Seo ◽  
Frank E. Talke
Keyword(s):  
Hard Disk Drives ◽  
Intermolecular Forces ◽  
Realistic Model ◽  
Coarse Grained ◽  
Attractive Potential ◽  
Head Disk Interface ◽  
Carbon Overcoat ◽  
Lubricant Transfer ◽  
Disk Interface ◽  
Dynamics Simulations

In current hard disk drives, the spacing between the slider and the disk is reduced to the order of 1–2 nm. At such a narrow spacing, intermolecular forces at the head-disk interface play an important role in achieving a stable slider-disk interface. Even in the absence of actual head-disk contact, lubricant transfer between a slider and a disk may occur. Transferred lubricant can change the flying characteristics of the slider in subsequent read-write operations. It is therefore apparent that lubricant transfer at the head-disk interface is undesirable. In this paper, molecular dynamics simulations were performed to investigate lubricant transfer between a slider and a disk. A so-called coarse-grained bead spring (CGBS) model was implemented. In this model, the Lennard-Jones potential, the short-range polar attractive potential, and the finitely extensible nonlinear elastic potential functions were used to describe the intermolecular interactions at the head-disk interface. Also, in order to develop a realistic model of the carbon overcoat, different modeling approaches are discussed, including the use of rigid coarse-grained beads and a 3-body Tersoff potential function.

scholarly journals A Description of Multiscale Modeling for the Head-Disk Interface Focusing on Bottom-Level Lubricant and Carbon Overcoat Models

2013 ◽  
Vol 2013 ◽  
pp. 1-27 ◽  
Author(s):  
Myung S. Jhon ◽  
Pil Seung Chung ◽  
Robert L. Smith ◽  
Lorenz T. Biegler
Keyword(s):  
Multiscale Modeling ◽  
Degrees Of Freedom ◽  
Dynamic Properties ◽  
Molecular Architecture ◽  
Head Disk Interface ◽  
Carbon Overcoat ◽  
Modeling Tools ◽  
Molecular Conformations ◽  
Disk Interface ◽  
Modeling Methodology

The challenges in designing future head disk interface (HDI) demand efficient theoretical modeling tools with flexibility in investigating various combinations of perfluoropolyether (PFPE) and carbon overcoat (COC) materials. For broad range of time and length scales, we developed multiscale/multiphysical modeling approach, which can bring paradigm-shifting improvements in advanced HDI design. In this paper, we introduce our multiscale modeling methodology with an effective strategic framework for the HDI system. Our multiscale methodology in this paper adopts a bottom to top approach beginning with the high-resolution modeling, which describes the intramolecular/intermolecular PFPE-COC degrees of freedom governing the functional oligomeric molecular conformations on the carbon surfaces. By introducing methodology for integrating atomistic/molecular/mesoscale levels via coarse-graining procedures, we investigated static and dynamic properties of PFPE-COC combinations with various molecular architectures. By bridging the atomistic and molecular scales, we are able to systematically incorporate first-principle physics into molecular models, thereby demonstrating a pathway for designing materials based on molecular architecture. We also discussed future materials (e.g., graphene for COC, star-like PFPEs) and systems (e.g., heat-assisted magnetic recording (HAMR)) with higher scale modeling methodology, which enables the incorporation of molecular/mesoscale information into the continuum scale models.

Effect of Laser Heating on Nanoscale Wear of DLC Thin Films in an Air Environment

2017 ◽  
Author(s):  
Norio Tagawa ◽  
Hiroshi Tani ◽  
Shinji Koganezawa ◽  
Renguo Lu
Keyword(s):  
Thin Films ◽  
Magnetic Recording ◽  
Laser Heating ◽  
Head Disk Interface ◽  
Carbon Overcoat ◽  
Disk Interface ◽  
Head Slider ◽  
Boundary Lubricant ◽  
Lubricant Films ◽  
Nanoscale Wear

To achieve magnetic recording densities greater than 10 Tb/in2, the head-disk interface (HDI) spacing is required to be less than 2–3 nm. Thus far, various technologies, such as heat assisted magnetic recording (HAMR), have been studied and developed to achieve such high magnetic recording densities [1]. To ensure the practical applicability of HAMR, it is important to understand the reliability of perfluoropolyether (PFPE) boundary lubricant films and carbon overcoat or diamond-like carbon (DLC) thin films used on the head slider and disk surfaces under heating conditions [2].

A study of dynamic friction at the head–disk interface

2000 ◽  
Vol 87 (9) ◽  
pp. 6152-6154 ◽  
Author(s):  
Huan Tang ◽  
Li-Ping Wang ◽  
Jing Gui ◽  
David Kuo
Keyword(s):  
Dynamic Friction ◽  
Head Disk Interface ◽  
Disk Interface

Effect of media overcoat on van der Waals interaction at the head–disk interface

2005 ◽  
Vol 97 (12) ◽  
pp. 126106 ◽  
Author(s):  
Raymond R. Dagastine ◽  
Lee R. White ◽  
Paul M. Jones ◽  
Yiao-Tee Hsia
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Head Disk Interface ◽  
Disk Interface
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