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. 2015 Nov 13;15(11):28854–28888. doi: 10.3390/s151128854

Figure 13.

Figure 13

Experimentally determined SPB steady state velocity as a function of the driving frequency ωex of the trapezoidal external magnetic field sequence with Hx,max=320 A/m and Hz,max=1640 A/m for a SPB diameter of 2 µm. In this series of experiments, the magnetically stripe patterned EB layer system was covered by a 700 nm photo resist layer. The theoretically predicted SPB velocity vSPB,sim was obtained at a SPB surface to resist distance of 320 nm. The uncertainty of the numerical simulation, vSPB,sim,min and vSPB,sim,max, respectively, was estimated by changing the Co70Fe30 layer thickness in the range of tF=6.5±0.5 nm in the calculation of the substrate’s MFL by using the analytical approach. Note that above the critical frequency of ωex16 Hz no directed transport of SPBs was observed (reprinted with permission from Holzinger et al. [27]).