Crossed ratchet effects for magnetic domain wall motion

Details Crossed ratchet effects for magnetic domain wall motion Crossed ratchet effects for magnetic domain wall motion

2007-09-03

arxiv.org/abs/0709.0189v1

Physical Review Letters 100 (2008) 037203

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.100.037203

We study both experimentally and theoretically the driven motion of domain walls in extended amorphous magnetic films patterned with a periodic array of asymmetric holes. We find two crossed ratchet effects of opposite sign that change the preferred sense for domain wall propagation, depending on whether a flat or a kinked wall is moving. By solving numerically a simple $\phi^4$-model we show that the essential physical ingredients for this effect are quite generic and could be realized in other experimental systems involving elastic interfaces moving in multidimensional ratchet potentials.

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