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No.1(pp.1-25)

Home > Issues > Volume 5 (2000) > No.1(pp.1-25)

Influence of Local Coercivity Variation on Magnetization Reversal Dynamics

Journal of Magnetics, Volume 5, Number 1, 31 Mar 2000, Pages 4-8

Sug-Bong Choe(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science Technology), Hyuk-Jae Jang(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science Technology), Sung-Chul Shin(Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science Technology)

Abstract

Local coercivity variation of Co/Pd nanomultilayers has been investigated by measuring the polar Kerr hysteresis loops of local areas of submicron size using a magnetooptic Kerr microscope system. Interestingly, the local coercivity distribution is very sensitive to an increase in the number of repeats: the (2-Å Co/11-Å Pd)₁₀ sample showed a smooth variation of the local coercivity, while (2-Å Co/11-Å Pd)₁₈ showed a large fluctuation. From micromagnetic considerations based on a thermally activated relaxation odel, we have found that this local coercivity variation has a crucial effect on the contrasting magnetization reversal behavior observed in those samples: dominant wall-motion far the former sample and dominant nucleation for the latter one.

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