Title :
High-speed coherent switching in fine grains
Author :
Lyberatos, A. ; Khizroev, S. ; Litvinov, D.
Author_Institution :
Seagate Res., Pittsburgh, PA, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
The effect of the relative head-to-medium velocity on the switching dynamics of individual grains is studied using the Landau-Lifshitz-Gilbert equation of motion. The coercive field of a grain may increase or decrease with velocity depending on the direction of crystal anisotropy. An asymmetry is present and the coercivity of an ensemble of grains with random in-plane anisotropy is found to increase, in agreement with measurements on a CoCr longitudinal magnetic recording medium
Keywords :
coercive force; magnetic anisotropy; magnetic particles; magnetic recording; magnetic switching; magnetisation reversal; CoCr; CoCr longitudinal magnetic recording medium; Landau-Lifshitz-Gilbert equation of motion; coercive field; fine grains; high-speed coherent switching dynamics; magnetization reversal; micromagnetic model; random in-plane anisotropy; relative head-to-medium velocity; single domain particle; Anisotropic magnetoresistance; Equations; Magnetic anisotropy; Magnetic field measurement; Magnetic heads; Magnetic recording; Magnetic switching; Perpendicular magnetic anisotropy; Saturation magnetization; Shape;
Journal_Title :
Magnetics, IEEE Transactions on
