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No.3(pp.73-109)

Home > Issues > Volume 5 (2000) > No.3(pp.73-109)

Measurements of Local Coercivity Distribution in Ferromagnetic Films Using Magneto-Optical Microscope Magnetometer (MOMM)

Journal of Magnetics, Volume 5, Number 3, 30 Sep 2000, Pages 81-84

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

Abstract

A magneto-optical microscope magnetometer (MOMM) has been developed to simultaneously measure 2-dimensional array hysteresis loops of each local area of 320 × 320-nm² spots on ferromagnetic films, in addition to grabbing time-resolved domain evolution patterns. Using the system, spatial distribution of local coercivity can be quantitatively generated and then, compared directly with domain patterns grabbed at precisely the same position of a sample. It is clearly demonstrated that local coercivity distribution governs domain reversal behavior via a thermally activated relaxation process.

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