School of Engineering and Technology, (SET)

AT81.04 : Recording Head Technology  2(2-0)

This course introduces the students to recording head technology in hard disc drive industry.   It covers both current recording technology and future technology with practical process in Hard Disk Drive (HDD) manufacturing.

Catalog Description:

Magnetic Recording Basics. Magnetic Recording Heads. Thin Film Head Fabrication. Tests of Recording Heads. Basic Disk Drives.    The Giant Magneto-Resistive (GMR). Effect. Spin Valve (SV) Head. GMR Design.



Course Outline:
I.             Magnetic Recording Basics
1.      Magnetism
2.      Recording Process
3.      Magnetic Circuit
II.          Magnetic Recording Heads
1.      Thin Film Inductive Head
2.      Magneto-resistive (MR) Effect
3.      MR Head
4.      Optical Kerr Effect
5.      Magneto-optical Head
III.       Thin Film Head Fabrication
1.      Slider Process
2.      Wafer Process
IV.       Tests of Recording Heads
1.      Static and Dynamic Electrical Test
2.      Fly Height Test
V.          Basic Disk Drives
1.      Servo Positioning
2.      Read/Write Interfaces
VI.       The Giant Magneto-Resistive Effect
1.      Exchange Coupling
2.      Ferro and Anti-Ferro Magnetic Properties
3.      Physical GMR Effect & Coefficient
4.      MR vs. GMR Comparison
VII.    Spin Valve (SV) Head
1.      SV Physics
2.      SV Head Configuration
3.      SV Transfer Curve
4.      Reader Sensitivity
VIII.GMR Head Designs
1.      Areal Density Perspective
2.      Future Head Designs

Lecture Notes

D. R. Askeland:
The Science and Engineering of Materials, 5th Edition, Thomsom, 2005.
D. A. Bell:
 Fundamentals of Electric circuits, 4th Edition, Prentice Hall, 1998.
J. C. Mallinson:
Magneto-Resistive and spin-valve Heads, Fundamentals and Applications, Academic Press, 2001.
D. Mee:
          Handbook of Magnetic Recording, McGraw-Hill, 1996.
Insight, IDEMA Publication
IEEE Transactions on Magnetism
IEEE Transactions on Industrial Electronics
Grading System:
The final grade will be computed from the following constituent parts:
Mid-term exam (30%)
Final exam (50%) and
Assignments/fieldtrip report (20%).
Closed-book examination is used for both mid-term and final exam.