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Bistable Abrikosov vortex diode made of a Py–Nb ferromagnet-superconductor bilayer structure
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Low voltage region of the curve of the Py/Nb bilayer recorded at 4.25 K and exhibiting two different depinning currents. The geometry of the bilayer is shown in the inset. (b) The curve in the full voltage range at 4.6 (superconducting state) and at 6.0 K (normal state). (c) Depinning and critical currents as a function of temperature. (d) Positive and negative depinning currents at 4.25 K as a function of magnetic field.

Image of FIG. 2.
FIG. 2.

(a) Voltage vs field curve during a loop of the magnetic field at 4.25 K at fixed positive bias current. In the inset, the curve of the device recorded in the two possible stable states at . (b) Magnetic field waveform used to prepare the ON or OFF states together with the voltage waveform of the device.

Image of FIG. 3.
FIG. 3.

Hysteresis loop of a Py(480)/Nb(60) unpatterned bilayer recorded at 10 K with magnetic field applied in the plane of the bilayer (a) or perpendicular to the bilayer (b). (c) Calculated cross-sectional view of magnetization in a Py layer with parameters similar to the experimental device. Also sketched is the Nb layer deposited on the top of Py. (d) Patterns (not on scale) of the top view of the stray fields experienced by Nb in the direction (out of plane of the strip). Bright (dark) regions are for field pointing in positive (negative) direction.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bistable Abrikosov vortex diode made of a Py–Nb ferromagnet-superconductor bilayer structure