Fig. 4: Absence of supercurrent spin-valve effect in Cu JJ-based SQUID. | Nature Nanotechnology

Fig. 4: Absence of supercurrent spin-valve effect in Cu JJ-based SQUID.

From: Chiral antiferromagnetic Josephson junctions as spin-triplet supercurrent spin valves and d.c. SQUIDs

Fig. 4

a–g, Data equivalent to Fig. 3a–g but for the d.c. SQUID composed of two Nb/Cu/Nb JJs with longer ds = 201 and 205 nm, in which the Cu spacer is epitaxial (Extended Data Fig. 2). Scale bar, 0.5 µm (a). Note that contrary to the Mn3Ge JJ-based SQUID, no asymmetric hysteretic response of time-averaged voltage V to perpendicular magnetic field μ0H⊥(≤|3 mT|) is detected in the Cu-JJ-based SQUID (g). From the periodic \(V\left( {\mu _0H_ \bot ,\;I \ge I_\mathrm{c}^{\mathrm{tot}}} \right)\) modulation (insets of d–f), we find a characteristic period of μ0Hosc = 0.16‒0.17 mT (Extended Data Fig. 3).

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