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ENE692

ENE692. LECTURE 4_2 HGA Technology. Basic HGA Technology. HGA assembly process HGA process control Suspension design and function Slider design and function. HGA Assembly process. Typical HGA process flow. HGA mechanical controls. HGA alignment. HGA pre-load.

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ENE692

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  1. ENE692 LECTURE 4_2 HGA Technology

  2. Basic HGA Technology • HGA assembly process • HGA process control • Suspension design and function • Slider design and function

  3. HGA Assembly process

  4. Typical HGA process flow

  5. HGA mechanical controls

  6. HGA alignment

  7. HGA pre-load

  8. Motivations from Gram load adjustment • Increasing Magnetic Recording Density requires lower and tighter flying height distribution. • Suspension Preload is a significant contributor to the flying height. Even more important for femto sliders. • HGA (Head Gimble Assembly) and HSA (Head Stack Assembly) processes can produce significant shift of the mean and sigma of gram load and flying height. • Gram load adjust can be used to compensate for the deviations caused by crown,camber, etch depths, PSA, stacking tolerances etc. on the flying heights.

  9. Motivations from Gram load adjustment Crown (C) is the maximum separation between the cylindrical contour along the flying direction and an imaginary plane drawn between leading and trailing edges of the ABS. Camber has a similar definition in the perpendicular direction between the two sides of the slider.

  10. How does the gram load adjustment work?

  11. HGA PSA/RSA

  12. Gimbal bond strength

  13. Fly Height

  14. Fly Height

  15. Impact of contamination

  16. Suspension design and function

  17. Gimbal strength testing

  18. Stress due to buckling and pitch

  19. Slider components

  20. Slider components • Air bearing • Read/Write circuit • Trailing edge • Leading edge

  21. Air bearing/fly model

  22. Fly height history

  23. Effect on Fly height

  24. Effect on Fly height

  25. Air bearing/fly model

  26. Air bearing/fly model

  27. Air bearing/fly model

  28. Performance prediction of air bearing

  29. Sensitivity analysis

  30. Take-off profile

  31. Unload Footprints

  32. Head-Disk Spacing Budget

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