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Dynamics of single vortices in grain boundaries: characteristics on the femtovolt scale
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Sketch of the GB sample. The bridge width is , GB misorientation angle is 24° symmetric ( and axes are −12° and 12° with respect to the GB). [(b) and (c)] Magnetic image of the GB area (b) at 10 K and and (c) at 10 K and , showing individual vortices (red) and antivortices (blue). The regions imaged are marked by the orange frames in (a). [(d) and (e)] The Hall probe signals vs time at 10 K for different currents applied to the GB measured at two positions marked in (b). The switching events are vortices passing under the probe. Red circles indicate three-level switching events.

Image of FIG. 2.
FIG. 2.

Pseudocolor image of the noise spectrum of the Hall signal for different sample currents at 10 K, measured at the location 1 in Fig. 1(b). Inset: difference between the power spectral densities at currents of 29 and 28 mA (green). The Lorentzian shaped spectrum is multiplied by similarly to the analysis in Ref. 16. The fit to two-level random telegraph noise is plotted in red.

Image of FIG. 3.
FIG. 3.

Current-voltage characteristics. The low voltage part (red and blue) was measured magnetically by the Hall probe [as shown in Figs. 1(d) and 2]. Different symbols are different locations along the GB. The current axis is normalized by which is the lowest current at which vortices were observed moving at 10 K. The high voltage part (green) was acquired by four-probe measurements on a neighboring bridge with identical dimensions and normalized to of that bridge measured magnetically (green data on the low voltage part). Inset: low voltage data at 10 K on a linear scale.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale