Micromagnetic study of the transition parameter and position jitter in perpendicular recording

• Published in: IEEE transactions on magnetics Vol. 39; no. 3; pp. 1846 - 1850
• Main Authors: Shimizu, Y., Bertram, H.N.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2003; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Anisotropic magnetoresistance; Anisotropy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Equations; Exact sciences and technology; Fluctuation; Fluctuations; Grain size; Grains; Head; Jitter; Magnetic properties and materials; Magnetic recording; Magnetic recording materials; Magnetism; Micromagnetics; Numerical simulation; Perpendicular magnetic recording; Physics; Recording; Signal to noise ratio; Simulation; Studies of specific magnetic materials; Theoretical study; Jitter; micromagnetic simulation; transition parameter; Magnetization curve; Exchange coupling; Anisotropy; perpendicular media; Coercive force; Recording material; Exchange interactions; Magnetic recording; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2003.810613

We examined the transition parameter and position jitter in perpendicular media by micromagnetic simulations that included thermal fluctuations. We observed the effects of grain size, intergranular exchange, anisotropy distributions, and orientation distributions. All these parameters affected both the transition parameter and the M-H loop coercivity squareness (S/sup */). The net effect was a universal dependence of transition parameter on S/sup */. The position jitter normalized by the grain diameter decreased with increasing S/sup */, but a universal curve was not found. In general, a small grain diameter, moderate exchange and low anisotropy distribution increase the high-density signal-to-noise ratio.