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Switching speed limitations in perpendicular magnetic recording media

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1 Author(s)
Lyberatos, A. ; Seagate Research, 1251 Waterfront Place, Pittsburgh, Pennsylvania 15222

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A method to study switching speed limitations in high-frequency magnetic recording is presented. The characteristic parameter is the minimum irreversible switching time that is evaluated by numerical simulation of the writing of a dibit of two transitions using Landau–Lifshitz dynamics. The dibit is written on a perpendicular polycrystalline thin film medium using a single-pole head with a soft underlayer. We study the physical factors that determine the ultimate data rate and consider the problem of optimization of switching speed by changing the relative head-medium velocity, the magnetocrystalline anisotropy, the rise time of the head field, the head-medium separation, the exchange intergranular coupling, and the dispersion in the direction and magnitude of the local anisotropy. © 2003 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:93 ,  Issue: 10 )

Date of Publication:

May 2003

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