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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) ^ with 0ex{0ex}=0ex{0ex}0. 240. 04 and that the correlation function along a MDW is governed by a wandering exponent 0ex{0ex}=0ex{0ex}0. 690. 07, in very good agreement with theories giving 0ex{0ex}=0ex{0ex}0. 25 and 0ex{0ex}=0ex{0ex}2/3. This is the first direct measurement of the creep regime for a moving interface in a disordered medium.
Lemerle et al. (1998) studied this question.