Areal density limits for perpendicular magnetic recording

• Published in: IEEE transactions on magnetics Vol. 38; no. 5; pp. 1886 - 1891
• Main Authors: Victora, R.H., Jianhua Xue, Patwari, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Electronics; Exact sciences and technology; Fluctuations; Magnetic anisotropy; Magnetic device characterization, design, and modeling; Magnetic devices; Magnetic flux; Magnetic heads; Magnetic recording; Magnetism; Magnetostatics; Micromagnetics; Permeability; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; High density; permeability; Theoretical study; Magnetic hysteresis; Subshell; micromagnetics; intergranular exchange; Magnetic susceptibility; Design; Micromagnetism; Perpendicular recording; Magnetic permeability; Recording density; Magnetic head; High-density perpendicular recording; Recording material; Magnetic recording; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2002.802791

A strategy for high-density perpendicular magnetic recording with a soft underlayer is introduced. The approach is based on three concepts: 1) the nonzero magnetic susceptibility of the recording layer; 2) the use of intergranular exchange to partially cancel magnetostatic effects; and 3) a novel head architecture. Micromagnetic simulations involving recording head, soft underlayer, and recording layer are employed to specify a particularly advantageous design. It is shown that the expected density approaches 1 Tbit/in/sup 2/.