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.

Edge dislocations in multi-component solid solution alloys: Beyond traditional elastic depinning

“…[32][33][34]. All data were normalized for each quantity for the different alloys [36]. It is clear that the effective β exponent is higher for the three softer alloys, than for the other four alloys, and meanwhile FeNi and Fe 0.7 Ni 0.11 Cr 0.19 show similar results to previous studies [13,24].…”