Readback Responses in Three Dimensions for Multilayered Recording Media Configurations

• Published in: IEEE transactions on magnetics Vol. 44; no. 7; pp. 1874 - 1890
• Main Authors: Wood, R.W., Wilton, D.T.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 3-D response; Anisotropic magnetoresistance; Anisotropic permeability; Approximation; Cross-disciplinary physics: materials science; rheology; DC null; Exact sciences and technology; Frequency response; layered media; Magnetic analysis; Magnetic anisotropy; Magnetic fields; Magnetic heads; Magnetic recording; Magnetic storage; Magnetism; Materials science; Mathematical analysis; Other topics in materials science; Permeability; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Physics; Recording; Recording instruments; Soft magnetic materials; Three dimensional; Multilayers; Magnetic permeability; layered media; Dimensions; 3-D response; Recording material; DC null; frequency response; Magnetic recording; Magnetic properties; Anisotropic permeability
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2008.920525

We have applied a technique for modeling the transmission of three-dimensional (3D) magnetic fields through an arbitrary number of layers of a layered structure to the specific case of a recording medium in order to study and explain the readback response for a variety of perpendicular recording configurations. We examine in particular the low-frequency response associated with flux-flow in the soft underlayer and the behavior of the main response for finite read and write widths. Our work leads to a useful analytic approximation for the 3D on-track readback response.