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. 2015 Oct 13;5:15097. doi: 10.1038/srep15097

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Copyright © 2015, Macmillan Publishers Limited

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(a) Typical current-voltage characteristics of a nano-SQUID probe without mechanical polishing and (b) after mechanical polishing of the tip of the probe at applied magnetic field of (i) 0.5, (ii) 0.3, and (iii) 0.1 mT. No hysteresis in the I-V characteristics was observed. (c) Modulation of SQUID voltage (V_SQ) by B_ext at current-bias of (i) 196.2, (ii) 198.1, (iii) 200.0, and (vi) 201.9 μA for a nano-SQUID probe without mechanical polishing. (d) Modulation of SQUID Voltage (V_SQ) in B_ext at current-bias of (i) 8.0, (ii) 10.0, (iii) 12.0, and (vi) 14.0 μA for a nano-SQUID probe after mechanical polishing.