Josephson soliton oscillators in a superconducting thin film resonator

J. Holm, Jesper Mygind, Niels Falsig Pedersen, Paola Barbara, G. Filatrella, A. Davidson

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Josephson soliton oscillators integrated in a resonator consisting of two closely spaced coplanar superconducting microstrips have been investigated experimentally. Pairs of long 1-D Josephson junctions with a current density of about 1000 A/cm2 were made using the Nb-AlOx-Nb trilayer technique. Different modes of half-wave resonances in the thin-film structure impose different magnetic field configurations at the boundaries of the junctions. The DC I-V characteristic shows zero-field steps with a number of resonator-induced steps. These structures are compared to RF-induced steps generated by phase-locking of the soliton motion to an external microwave source. The two different resonant configurations identified may be interpreted as a coupling to the microwave field at the end boundary and as a more homogeneous coupling distributed over the junction length
Original languageEnglish
JournalI E E E Transactions on Applied Superconductivity
Issue number1(4)
Pages (from-to)2504-2507
Publication statusPublished - 1993

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