Tribological phenomena at the head–disk interface of thin‐film rigid disks

1989 ◽  
Vol 7 (3) ◽  
pp. 2491-2495 ◽  
Author(s):  
Hsiao‐chu Tsai ◽  
Yassin Mehmandoust ◽  
Hamid Samani ◽  
Atef Eltoukhy
Keyword(s):  
Thin Film ◽  
Head Disk Interface ◽  
Disk Interface ◽  
Rigid Disks

Simulation of Contact Behavior of the Thin Film of Hard Disk at Head/Disk Interface

2011 ◽  
Vol 287-290 ◽  
pp. 2339-2342
Author(s):  
Hong Rui Ao ◽  
Deng Pan ◽  
Hong Yuan Jiang
Keyword(s):  
Thin Film ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Hertzian Contact ◽  
Von Mises Stress ◽  
Head Disk Interface ◽  
Disk Interface ◽  
Slider Motion ◽  
Von Mises ◽  
Layered Thin Film

The contact at head/disk interface in hard disk drives subject to an external shock has been studied using the finite element method. A rigid cylinder moving over a two-layered thin film was implemented to simulate the contact between the recording slider and the disk. The effects of different friction coefficients on the von Mises stress of two-layered thin film were investigated. The relation between pressed depth and width of deformation has been obtained. Results show that the amplitude decreases with increase of friction coefficient while the period of slider motion is diminution. In addition, the stress distribution fits Hertzian contact theory.

scholarly journals OPTICAL SURFACE ANALYSIS OF THE HEAD DISK INTERFACE OF THIN FILM DISKS

1994 ◽  
Vol 18 (S_2_PMRC_94_2) ◽  
pp. S2_31-31 ◽  
Author(s):  
Sleven W. Meeks ◽  
Walter E. Weresin ◽  
Hal J. Rosen
Keyword(s):  
Thin Film ◽  
Surface Analysis ◽  
Head Disk Interface ◽  
Optical Surface ◽  
Disk Interface

Effect of particulate contamination on the friction and wear of a magnetic head-rigid disk interface

2000 ◽  
Vol 214 (5) ◽  
pp. 493-505 ◽  
Author(s):  
S Chandra ◽  
B Bhushan
Keyword(s):  
Failure Mechanism ◽  
Friction And Wear ◽  
Particle Concentration ◽  
Damage Mechanism ◽  
Flying Height ◽  
Head Disk Interface ◽  
Magnetic Head ◽  
Disk Interface ◽  
Particulate Contamination ◽  
Rigid Disks

Particulate contamination studies were carried out with laser-textured and mechanically textured magnetic rigid disks and nanosliders. The effects of particle concentration and its size, particle material, duration of exposure to contamination, interface speed and disk textures were studied. The head-disk interface (HDI) durability increased as particle concentration decreased. The effect of different hard-particle materials was attributed to how easily it can form agglomerates. Data indicate that limited-time exposure to a class 10 000 environment will not deter tribological performance of the HDI. In a contaminated environment, head flying in the data zone exhibited higher durability than that in the-lase textured zone. However, the mechanically textured disk and the data zone of laser-textured disks showed comparable durability in the presence of contamination. The HDI damage mechanism and pattern changed as the disk speed changed. A failure mechanism to show how the airborne particles interact with the interface is presented. The effects of the HDI geometry, flying height, pitch angle which controls the air flow pattern govern the failure mechanism in the flying mode.

Contact Analysis of Regular Patterned Rough Surfaces in Magnetic Recording

1995 ◽  
Vol 117 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Bharat Bhushan ◽  
Xuefeng Tian
Keyword(s):  
Thin Film ◽  
Rough Surface ◽  
Optimum Design ◽  
Contact Area ◽  
Magnetic Recording ◽  
Design Criteria ◽  
Head Disk Interface ◽  
Magnetic Head ◽  
Disk Interface ◽  
Meniscus Force

The contact of regular patterned rough surface in magnetic recording was analyzed to predict the contact area, meniscus force and permissible load under thin-film lubricated conditions. The contact area, the meniscus force, and the permissible load at the magnetic head-disk interface were studied as a function of the shape, size and the occupation of asperities. Optimum design criteria for both constant occupation and nonconstant occupation of identical asperities were developed to design future magnetic head and disk surfaces.

Magnetic Head-Media Interface Temperatures—Part 3: Application to Rigid Disks

1992 ◽  
Vol 114 (3) ◽  
pp. 420-430 ◽  
Author(s):  
B. Bhushan
Keyword(s):  
Thin Film ◽  
Contact Area ◽  
Magnetic Particles ◽  
Temperature Drop ◽  
Transient Temperature ◽  
Thermal Gradients ◽  
Asperity Contact ◽  
Disk Interface ◽  
Zn Ferrite ◽  
Rigid Disks

A thermal analysis has been used to predict transient temperature rises at a typical head-particulate-disk interface and a head-thin-film-disk interface. Thermal properties of the various thin-films used in the construction of magnetic rigid disks are measured. Average and maximum transient temperature rises for the assumed head-particulate-disk interface over the contact area are 34 and 44°C, respectively for an Al2O3-TiC slider. If the exposed magnetic particles or alumina particles contact the slider surface, the transient temperature rise could be more than 1000°C. Average and maximum transient temperature rises for the assumed head-thin-film-disk interface over the contact area are 56 and 81°C, respectively for an Al2O3-TiC slider and 77 and 110°C, respectively for an Mn-Zn ferrite slider. The durations of asperity contact generally are less than 100 ns. The thermal gradients perpendicular to the sliding surfaces are very large (a temperature drop of 90 percent in a depth of typically less than a contact diameter or less than a micron).

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