Surface morphology of step-edge substrates with different step angles, (a) 70° STO substrate and (b) 25° MgO substrate, probed with atomic force microscope.
(Color online) (a) curves of ten Josephson junctions connected in series at and (b) curves of 1-SQUID and 15-SQUID megnetometers connected in series at .
(Color online) Schematics of (a) the SQUID magnetometer. (b) Expanded plot of SQUIDs with junction widths of 2, 3, 4, and . Two dummy SQUIDs were incorporated into the serial SQUID array. A total of 200 Josephson junctions are inserted in the pickup loop to form serial flux dams.
(Color online) curve for one-SQUID and two-SQUID magnetometers at .
(Color online) Magnetic field sensitivity of the SQUID magnetometer with 200 serial flux dams for (a) one-SQUID magnetometer, and (b) two-SQUID magnetometer. (c) Two-SQUIDs without flux dams on zero-field cooling. The measurement temperature is .
(Color online) curves (a) and (b) show the flux dams open and close for the SQUID magnetometer. The inset shows the curve when the flux dams are close.
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