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Research Papers: Magnetic Storage

The Critical Conditions for Tribo-Demagnetization of Perpendicular Magnetic Recording Disk Under Sliding Contact

[+] Author and Article Information
W. F. Jiang

Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China

D. F. Diao1

Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, Chinadfdiao@mail.xjtu.edu.cn

1

Corresponding author.

J. Tribol 132(2), 021901 (Mar 11, 2010) (10 pages) doi:10.1115/1.4000734 History: Received September 15, 2008; Revised November 22, 2009; Published March 11, 2010; Online March 11, 2010

The critical conditions (critical stress and critical temperature) for the demagnetization of perpendicular magnetic recording disks were investigated. A tribo-demagnetization test of a perpendicular magnetic recording disk with a low load ball-on-disk system and the scan of the disk with the magnetic head were sequentially carried out to evaluate the critical force and sliding velocity for the occurrence of demagnetization, and the relationship between the two critical factors. Then, a finite element model using thermomechanical coupling was developed to calculate the critical stress and temperature of the magnetic disk based on the critical force and sliding velocity of the experiment result. Finally, a method based on the tribo-demagnetization test in combination with finite element analysis to calculate the critical conditions for the demagnetization of the perpendicular magnetic recording disk under sliding contact was proposed.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic sketch of ball-on-disk tribo-demagnetization designed apparatus: (a) magnetic disk scanning system and (b) ball-on-disk loading system

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Figure 2

Photos of tribo-demagnetization apparatus: (a) experiment rig, (b) ball-on-disk pair, (c) overview of the apparatus, and (d) screen capture of the scanning result

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Figure 3

(a) Static loading of sensor without the rotation of disk and (b) normal force with the rotation of disk

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Figure 4

Illustration of loading position of the tribo-demagnetization test

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Figure 5

Normal force versus sliding velocity and their effect on demagnetization of perpendicular magnetic recording disk (areal recording density is 101 Gb/in.2)

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Figure 6

Ball-on-disk contact model. (a) Equivalent roughness with multi-asperities of ball/disk and (b) single asperity contact.

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Figure 7

Illustration of finite element model

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Figure 8

(a) Normal force and (b) friction force during ball/disk contact, V=20.3 m/s

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Figure 9

(a) Normal force and (b) friction force during ball/disk contact, V=21.8 m/s

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Figure 10

Contours of temperature in the semi-infinite medium of magnetic disk under sliding contact (W=0.47 mN, S=0.52 μm, and V=17.34 m/s)

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Figure 11

(a) Contours of σx in the semi-infinite medium and (b) in the magnetic recording layer (CoPtCr) of magnetic disk under sliding contact (W=0.47 mN, S=0.52 μm, and V=17.34 m/s)

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Figure 12

Schematic sketch of pin-on-disk pair to test the sliding temperature

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Figure 13

Temperature rise versus time of magnetic disk under sliding contact

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