Abstract
We fabricated and characterized a weakly coupled magnetic Josephson junction based on epitaxial NbN/Ni60Cu40/NbN trilayer heterostructures on single crystal MgO (100) substrates. X-ray diffraction and cross-sectional scanning transmission electron microscopy were used to verify the epitaxial growth of NbN/Ni60Cu40/NbN trilayer, while the ferromagnetic properties of NiCu on NbN film were recorded by plotting the magnetization as a function of both the temperature and the magnetic field strength. The NbN/Ni60Cu40/NbN junctions demonstrated typical Josephson effect with a nonlinear overdamped current–voltage characteristic and a characteristic voltage of 9.1 μV. The magnetic field dependence of the junction critical current showed a nearly ideal Fraunhofer-like pattern with a magnetic field shift of about 12 Oe due to the remanent magnetization of Ni60Cu40 layer.
Highlights
Superconductor/insulator/superconductor (SIS) Josephson tunnel junctions have been wildly used in superconducting electronic devices, such as SQUIDs, SIS mixers, SFQ, Qubits, and so on.[1,2,3,4] Recently, superconductor/ferromagnet/superconductor (SFS) and superconductor/insulator/ ferromagnet/superconductor (SIFS) Josephson junctions are gradually attracting the attention of researchers, because of their rich physics, and many applications
Ferromagnetic Josephson junctions based on epitaxial Niobium nitride (NbN)/Ni60Cu40/NbN trilayer
Through SFS Josephson junction, we can detect the spatial oscillation of the electron density state with changing the thickness of the F layer and realize the so called π junction, which can be integrated in SQUID, SFQ or Qubit structure to reduce their scale.[5,6,7,8]
Summary
Superconductor/insulator/superconductor (SIS) Josephson tunnel junctions have been wildly used in superconducting electronic devices, such as SQUIDs, SIS mixers, SFQ, Qubits, and so on.[1,2,3,4] Recently, superconductor/ferromagnet/superconductor (SFS) and superconductor/insulator/ ferromagnet/superconductor (SIFS) Josephson junctions are gradually attracting the attention of researchers, because of their rich physics, and many applications. Ferromagnetic Josephson junctions based on epitaxial NbN/Ni60Cu40/NbN trilayer
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