Magnetic domain wall (DW) dynamics in submicron ferromagnetic wires has been investigated in real-time regime by using tunneling magnetoresistance effect. The DW velocity as a function of magnetic field increases at low field range and takes a local maximum. After stagnation, the velocity starts to increase again. This is a typical signature of the Walker breakdown. Above the Walker field, the real-time traces of individual events show complex behaviors, which suggest the stochastic nature of the DW motion.
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Kondou et al. (2008) studied this question.
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