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A schematic of the interaction of a soft magnetic dot with an applied magnetic flux.
A scanning electron micrograph of an Al loop with a Py dot at the center (Sample B). The white bar corresponds to .
The hysteresis loop of Py dots used in the experiment measured at in the perpendicular field. The inset shows the magnetization of the dots for the applied fields .
The -curves of Sample A (upper part) taken at , , and , and Sample B (lower part) taken at , , and . Open symbols are the experimental data, whereas the solid lines are the theoretical curves. A higher critical current corresponds to a lower temperature.
The -curve of the reference sample taken at . The filled symbols are the experimental data, whereas the solid line is the theoretical curve.
The curves of Sample B at for , , , and .
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