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Detection of single magnetic nanobead with a nano-superconducting quantum interference device
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View: Figures


Image of FIG. 1.
FIG. 1.

SEM image of a single FePt particle bead positioned at the Nb nano-SQUID perimeter. In the experimental setup the applied dc magnetic field perpendicular to the SQUID loop (geometric area is ), whereas the effective area from measured flux period is . Thus, the penetration depth appears but this ignores flux focusing/defocusing.

Image of FIG. 2.
FIG. 2.

(a) Schematic circuit diagram showing nano-SQUIDs (in the dotted line box) and SSA as preamplifier in two-stage configuration, where is the bias resistance. (b) Cold stage of the measurement probe with a SSA chip, superconducting coil and nano-SQUID chip (located inside the coil).

Image of FIG. 3.
FIG. 3.

(a) SQUID output at 7.8 K with no particle present (the thin line is field sweep up, thick line is field sweep down). (b) SQUID output with a single FePt nanobead present at same temperature showing hysteresis.

Image of FIG. 4.
FIG. 4.

(a) Hysteresis plots for the single FePt nanobead for a range of applied magnetic fields. (b) Magnetization measurements of a large ensemble of FePt beads of various sizes at different temperatures, indicating the blocking temperature, , at about 10 K.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Detection of single magnetic nanobead with a nano-superconducting quantum interference device