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Real-time direct observation of temperature-dependent domain reversal behavior in epitaxial MnAs film on GaAs(001)

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4 Author(s)
Ryu, Kwang-Su ; Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea ; Shin, Sung-Chul ; Akinaga, Hiro ; Manago, Takashi

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We have investigated temperature-dependent domain reversal behavior in the MnAs film epitaxially grown on GaAs(001) using a magneto-optical microscope capable of real-time direct observation of domain evolution. Interestingly enough, the domain reversal in the temperature range of 20 °C∼35 °C shows the domain wall-motion process with the sawtooth type and, then, it changes to the nucleation-dominant process above 37.5 °C. This change could be understood by the decrease of the dipolar interaction energy and the disconnection of the ferromagnetic α-MnAs stripes, induced by the decrease of the α-MnAs volume ratio with increasing temperature.

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Applied Physics Letters  (Volume:88 ,  Issue: 12 )