On the Thermal Behavior of Giant Magnetoresistance Heads

[+] Author and Article Information
B. K. Gupta, Kenneth Young, Sameera K. Chilamakuri, Aric K. Menon

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J. Tribol 123(2), 380-387 (Jun 16, 2000) (8 pages) doi:10.1115/1.1308005 History: Received March 06, 2000; Revised June 16, 2000
Copyright © 2001 by ASME
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Menon,  A. K., and Gupta,  B. K., 1999, “Nanotechnology A Data Storage Perspective,” Datatech, 2, pp. 13–24.
Gupta,  B. K., and Menon,  A. K., 1999, “Characterization of the Head-Disk Interface at Nanometer Dimensions,” IEEE Trans. Magn., 35, pp. 764–769.
Li,  Y., and Talke,  F., 1990, “Limitation and Correction of Optical Profilometry in Surface Characterization of Carbon Coated Magnetic Recording Disks,” ASME J. Tribol., 112, pp. 670–677.
Smallen,  M., and Lee,  J. J. K., 1993, “Pole Tip Recession Measurements on Thin Film Heads using Optical Profilometry with Phase Correction and Atomic Force Microscopy,” ASME J. Tribol., 115, pp. 382–386.
Young,  K. F., 1990, “Finite Element Analysis of Planar Stress Anisotropy and Thermal Behavior in Thin Films,” IBM J. Res. Dev., 34, pp. 706–717.
Bhushan, B., and Gupta, B. K., 1991, Handbook of Tribology: Materials, Coatings and Surface Treatments, McGraw–Hill, New York.


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Schematic of a giant magnetoresistance head stack
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Schematic of the head–disk interface with protruded pole tips and alumina overcoat
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Representative image from an optical profiler used to estimate the pole tip recession and the overcoat protrusion
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PTR and AOP offset factors as a function of temperature
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The increase in temperature of the region around the writer pole as a function of the square of the current in the writer pole
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Cross-section SEM images of heads with single and dual layers of writer coils. The volume of metal, photoresist and alumina varies significantly with head stack design.
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Representative AFM images over the pole tips regions at (a) ambient and (b) elevated temperature (75°C). The 50°C temperature increase results a protrusion of shields by 3–4 nm.
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(a) A typical example of temperature versus PTR plot. Slope of this plot gives PTR per 1°C rise in temperature; (b) a typical example of I2 versus PTR plot.
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(a) Per degree centigrade change in the recession/protrusion of alumina basecoat, shields, writer pole, and alumina overcoat for various head stack designs; (b) the recession/protrusion of alumina basecoat, shields, writer pole, and alumina overcoat for various head stack designs due to joule heating by 1 mA2 current increase
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Illustration of the distribution of materials in the various layers, the mesh density of the 2D finite element model, and a graphical representation of the ABS surface displacement driven by the uniform temperature change
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An isometric view of the 3D model that is 1/2 of the twofold symmetrical structure with the thermal PTR profiles plotted in their respective locations
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Thermal PTR profiles along the length of the slider body obtained using modeling and measurements for various head stack designs. In this figure, the origin is moved to the gap location and the different layers are represented by different coloring schemes.
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Measured and calculated current PTR profiles for three of the four different head designs. Calculations are compared to measurements at the mid plane and the other calculations are added to show the behavior over the full ABS.
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Effect of thermal expansion coefficients of alumina and photoresist on the ABS profile at elevated temperature
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Effect of thickness of overcoat, basecoat, and head stack on the ABS profile at elevated temperature
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Effect of replacing alumina in the overcoat, basecoat, and everywhere in the head stack by SiC and SiO2 on the ABS profile at elevated temperature



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