Domain wall creep in an ising ultrathin magnetic film

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Lemerle, S. | Ferré, J. | Chappert, C. | Mathet, V. | Giamarchi, T. | Le Doussal, P.

Edité par CCSD ; American Physical Society -

International audience. 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 μ = 0.24 ± 0.04 and that the correlation function along a MDW is governed by a wandering exponent ζ = 0.69 ± 0.07, in very good agreement with theories giving μ = 0.25 and ζ = 2/3. This is the first direct measurement of the creep regime for a moving interface in a disordered medium.

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