Depinning exponents of thin film domain walls depend on disorder strength

Abstract

Domain wall dynamics in ferromagnets is complicated by internal degrees of freedom of the domain walls. We develop a model of domain walls in disordered thin films with perpendicular magnetic anisotropy capturing such features, and use it to study the depinning transition. For weak disorder, excitations of the internal magnetization are rare, and the depinning transition takes on exponent values of the quenched Edwards-Wilkinson equation. Stronger disorder results in disorder-dependent exponents concurrently with nucleation of an increasing density of Bloch lines within the domain wall.

5 pages, 5 figures

References in corpus (7)

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Cited by in corpus (3)

• Edge dislocations in multi-component solid solution alloys: Beyond traditional elastic depinning
• Deterministic roughening in the dc-driven precessional regime of domain walls
• Nonsteady dynamics at the dynamic depinning transition in the two-dimensional Gaussian random-field Ising model