Speaker
Description
Josephson coupling between superconducting and ferromagnetic layers is driving new fundamental physics and innovative applications for superconducting electronics and quantum circuits [1,2]. Examples are: the possibility to switch the ground state of a Josephson junction (JJ) from a 0 to a π phase state, the existence of JJs having a doubly degenerate ground state with an average Josephson phase ψ = ±φ, the possibility to carry spin-triplet supercurrent in the presence of certain types of magnetic inhomogeneity.
We will report on a comprehensive study of dissipation in hybrid JJs composed by pure metallic ferromagnetic layers [3] or by ferromagnetic-insulator barriers [4,5,6]. Transport measurements highlight different dissipation sources, which reflect different properties of the barriers and of the composition of the junctions. This study provides the electrodynamic characterization [3,6,7] necessary for the possible use of these systems in more complex circuits, as cryogenic memories or spintronic devices, and suggests new solutions of ferromagnetic JJs in superconducting qubits.
- A. A. Golubov and M. Yu Kupriyanov Nat. Mater. 16, 156-157 (2017).
- A. K. Feofanov, et al. Nat. Phys. 6, 593-597 (2010).
- D. Massarotti, et al. Phys. Rev. B 98, 144516 (2018).
- D. Massarotti, et al. Nat. Commun. 6, 7376 (2015).
- R. Caruso, et al. J. Appl. Phys. 123, 133901 (2018).
- R. Caruso, et al. Phys. Rev. Lett. 122, 047002 (2019).
- H. Ahmad et al. in preparation.
