Improved approximations for two-dimensional perpendicular magnetic recording heads

• Published in: IEEE transactions on magnetics Vol. 39; no. 4; pp. 2098 - 2102
• Main Authors: Shute, H.A., Wilton, D.T., McKirdy, D.Mc.A., Mapps, D.J.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2003; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Approximation; Corners; Digital recording; Electronics; Estimates; Exact sciences and technology; Fast Fourier transforms; Fourier transforms; Geometry; Magnetic devices; Magnetic heads; Magnetic recording heads; Magnetic shielding; Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc; Magnetism; Mathematics; Nonlinear magnetics; Perpendicular magnetic recording; Poles; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Shields; Soft magnetic materials; Two dimensional; Two dimensional displays; Perpendicular recording; mathematics; magnetic recording/reading heads; Recording head; Approximations; Theoretical study; Magnetic head; Digital recording; Read head; Magnetic recording
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2003.812704

We present an accurate method of obtaining approximate field components for a two-dimensional perpendicular magnetic recording head in the presence of a soft magnetic underlayer. It is easy to use and may be applied to any configuration of rectangular poles, shields, and gaps. Formulas for the potential at the air-bearing surface across a pole-shield gap or beyond a pole edge are obtained by assuming nonlinear magnetic potential drops both from a pole corner and from a shield corner to the underlayer. The fast Fourier transform then gives the potential and field components elsewhere. We demonstrate the accuracy of the field component estimates for an unshielded single pole and for a symmetrically shielded single pole.