The effects of pole geometry on recording performance of narrow track thin film heads

• Published in: IEEE transactions on magnetics Vol. 30; no. 2; pp. 275 - 280
• Main Authors: Cain, W.C., Thayamballi, P.K., Vea, M.P.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.03.1994; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Coercive force; Computational modeling; Disk recording; Electronics; Error analysis; Exact sciences and technology; Geometry; Magnetic heads; Predictive models; Recording and replay of audio and video signals; Solid modeling; Space vector pulse width modulation; Storage and reproduction of information; Transistors; Thin film device; Error estimation; Recording head; Theoretical study; Experimental study; Modeling; Thin film; Recording density; Error diagnostic; Magnetic disk; Drive mechanism; Recording; Read head; Comparative study; Geometrical factor; Magnetic recording
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.312272

The effects of pole trimming on the recording performance of thin film heads is investigated through experiment and modeling. Three dimensional head fields are computed numerically for various pole geometries, and are used by a simple two dimensional recording simulation to determine written width, erase width, read width and isolated pulse response. These parameters are then compared to experimental values measured on trimmed and untrimmed heads. Both modeled and experimental parameters are then used as input to a system error rate simulation to determine the effects of pole trimming on system error rate as a function of track density. Good agreement is found between model and experimental parameters. The error rate results suggest that in a system with a reasonable track misregistration (TMR), a track density increase of 7 to 9% can be obtained by trimming the inductive head poles.< >