Crossed-ratchet effects and domain wall geometrical pinning

Abstract

The motion of a domain wall in a two dimensional medium is studied taking into account the internal elastic degrees of freedom of the wall and geometrical pinning produced both by holes and sample boundaries. This study is used to analyze the geometrical conditions needed for optimizing crossed ratchet effects in periodic rectangular arrays of asymmetric holes, recently observed experimentally in patterned ferromagnetic films. Geometrical calculations and numerical simulations have been used to obtain the anisotropic critical fields for depinning flat and kinked walls in rectangular arrays of triangles. The aim is to show with a generic elastic model for interfaces how to build a rectifier able to display crossed ratchet effects or effective potential landscapes for controlling the motion of interfaces or invasion fronts.

13 pages, 18 figures

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• Magnetic domain wall creep and depinning: a scalar field model approach
• Spatially periodic domain wall pinning potentials: Asymmetric pinning and dipolar biasing
• Thermally rounded depinning of an elastic interface on a washboard potential
• Degradation of domains with sequential field application
• Tuning Ginzburg-Landau theory to quantitatively study thin ferromagnetic materials