Main pole

Fig. 8. The main-pole driven head in combination with a Co—Cr/Ni—Fe double-layer medium for perpendicular recording.

Fig. 8.1 (a) Schematic illustration ol thin film head with a helical coil at the main pole tip. (b) Dependence of field distribution on coil recession height, h [2]. 1999 IEEE... 

Fig. 8.3 Main process steps of CF-SPT head fabrication (a) bottom return yoke, (b) bottom coU, (c) main pole, (d) top coil, (e) top return yoke, and (f) ABS...

In the CF-SPT head, the main pole is energized using a part of the cusped field generated by the opposing coil conductors. Field calculations using finite element method (FEM) revealed that the fields created at the main pole by the cusp coil and... 

As the head track width decreases, remanent magnetization of the main pole tip is likely to occur because of stress-induced anisotropy and increased shape anisotropy in the normal direction to the ABS. The field from this remanent magnetization can... 

Fig. 8.10 (a) Effect of flare angle on domain structure of main pole, (b) Signal decay with time for different flare angles... 

A shield structure has been proposed to improve the field gradient where the shield yoke is placed near the main pole [15, 16]. An example of a shielded SPT head based on a CF-SPT head [17] is depicted in Fig. 8.1 la. The shield yoke absorbs the magnetic flux emanating from the side of the main-pole and prevents it from... 

Fig. 8.14 Head field as a function of base core size, and Tm, for tapered and stepped main poles. Head field is normalized by saturation magnetization...

Fig. 8.15 (a) Variation of pole tip structure Type / - tapered structure in both down and cross track directions Type //-tapered only in the down track direction Type III-no tapered structure, (b) Comparison of head fields for tapered main poles of various types... 

Kanai Y et al (2003) Recording field analysis of narrow-track SPT head with side shields, tapered main pole, and tapered return path for 1 Tb/inL IEEE Trans Magn 39 1955-1960... 

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