Modulation depth of series SQUIDs modified by Josephson junction area<sup>

Modulation depth of series SQUIDs modified by Josephson junction area

Liu Jie¹, Gao He^{2, 3}, Li Gang¹, Wei Li Zheng², Ahmada Kamal¹, Ying Shan Zhang¹, Liu Jian She¹, Chen Wei^{1, †}

(color online) AFM photographs of (a) Nb film, (b) Nb/AlO_x, (c) Nb/AlO_x/Nb layer. (d) Morphology of Nb/AlO_x with the area of 5 μm × 5 μm.