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arXiv · 1112.1239

Tunable resistivity of individual magnetic domain walls

Jeroen H. Franken·Mark Hoeijmakers·Henk J M Swagten·Bert Koopmans
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Abstract

Despite the relevance of current-induced magnetic domain wall (DW) motion for new spintronics applications, the exact details of the current-domain wall interaction are not yet understood. A property intimately related to this interaction is the intrinsic DW resistivity. Here, we investigate experimentally how the resistivity inside a DW depends on the wall width D, which is tuned using focused ion beam irradiation of Pt/Co/Pt strips. We observe the nucleation of individual DWs with Kerr microscopy, and measure resistance changes in real-time. A 1/D^2 dependence of DW resistivity is found, compatible with Levy-Zhang theory. Also quantitative agreement with theory is found by taking full account of the current flowing through each individual layer inside the multilayer stack.

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Jeroen H. Franken, Mark Hoeijmakers, Henk J M Swagten, Bert Koopmans. 2011-12-06. Tunable resistivity of individual magnetic domain walls. https://doi.org/10.1103/physrevlett.108.037205

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