Relationships between stray field on pole tip and occurrence of pole erasure

Perpendicular magnetic recording system has instability of data erasure on a hard-disk-drive due to remanent magnetization of writer pole tip, which is known as pole erasure. In previous works (2005), the authors reported the relationships between the occurrence of pole erasure and the material properties of writer pole film. Zhou and Zhu (2005) showed the physical size effect of pole tip on remanent magnetization of perpendicular recording head, and they measured the distribution of remanent magnetization in the pole tip by contact scanning recording techniques. In this study, the strength and distribution of stray field on pole tip are measured by MFM techniques. The relationships between occurrence of pole erasure, stray field strength, and material properties of writer pole film are also discussed.