Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Measurements of Local Coercivity Distribution in Ferromagnetic Films Using Magneto-Optical Microscope Magnetometer (MOMM)

  • Choe, Sug-Bong (Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology) ;
  • Shin, Sung-Chul (Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology)
  • Published : 2000.09.01
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Abstract

A magneto-optical microscope magnetometer (MOMM) has been developed to simultaneously measure 2-dimensional array hysteresis loops of each local area of $320\times320-nm^2$ 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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