We have studied the motion of a magnetic domain wall (MDW) driven by a magnetic field H in a 2D ultrathin Pt/Co/Pt film showing perpendicular anisotropy and quenched disorder. MDW velocity measurements down to the so called creep regime show that the average energy barrier scales as (1/H)^μ with μ0ex0ex=0ex0ex0.24±0.04 and that the correlation function along a MDW is governed by a wandering exponent ζ0ex0ex=0ex0ex0.69±0.07, in very good agreement with theories giving μ0ex0ex=0ex0ex0.25 and ζ0ex0ex=0ex0ex2/3. This is the first direct measurement of the creep regime for a moving interface in a disordered medium.
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Lemerle et al. (1998) studied this question.
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