High Density Perpendicular Recording With Wrap-Around Shielded Writer

• Published in: IEEE transactions on magnetics Vol. 46; no. 3; pp. 722 - 729
• Main Authors: Bai, Daniel Z., Wu, Yan, Dovek, Moris, Liu, Yue, Zhang, Xiaofeng, Liu, Kowang, Takano, Kenichi, Zhou, Yuchen
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.03.2010; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adjacent track erasure; Cross-disciplinary physics: materials science; rheology; Degradation; Density; Design engineering; Disk recording; Exact sciences and technology; Fabrication; far track erasure; Geometry; Hard disks; High density; Interference suppression; Magnetic recording; Magnetism; Material properties; Materials science; Other topics in materials science; Performance loss; Perpendicular magnetic recording; perpendicular recording; Physics; Recording; Shields; side shield; Solid modeling; Systems design; wrap-around shield; wrap-around shield; perpendicular recording; Density; Adjacent track erasure; far track erasure; Magnetic recording; Magnetic properties; side shield
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2009.2034753

Wrap-around shielded writers combining both trailing shield and side shield have been studied both by modeling and by experiments. WAS design is demonstrated to have superior performance over its predecessor trailing shielded writer in perpendicular magnetic recording systems. While maintaining the down-track performance, the side shield significantly reduces the side fringing field, thus enabling high track densities. In this paper, various aspects of WAS design are investigated. Issues unique to side shielded design such as near and far track erasure are also discussed in detail. An outlook of future PMR writer and recording systems design is presented at the end.