Magnetic Josephson junctions (MJJs) have emerged as a prominent playground to explore the interplay between superconductivity and ferromagnetism. A series of fascinating experiments have revealed striking phenomena at the superconductor/ferromagnet (S/F) interface, pointing to tunable phase transitions and to the generation of unconventional spin-triplet correlations. Here, we show that the Josephson effect, being sensitive to phase space variation on the nanoscale, allows a direct observation of the spin polarization of the S/F interface. By measuring the temperature dependence of the Josephson magnetic field patterns of tunnel MJJs with strong and thin F-layer, we demonstrate an induced nanoscale spin order in S along the superconducting coherence length at S/F interface, i.e., the inverse proximity effect, with the first evidence of full spin screening at very low temperatures, as expected by the theory. A comprehensive phase diagram for spin nanoscale ordering regimes at S/F interfaces in MJJs has been derived in terms of the magnetic moment induced in the S-layer. Our findings contribute to drive the design and the tailoring of S/F interfaces also in view of potential applications in quantum computing.

Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions / Satariano, Roberta; Volkov, Anatoly Fjodorovich; Ahmad, Halima Giovanna; Di Palma, Luigi; Ferraiuolo, Raffaella; Vettoliere, Antonio; Granata, Carmine; Montemurro, Domenico; Parlato, Loredana; Pepe, Giovanni Piero; Tafuri, Francesco; Ausanio, Giovanni; Massarotti, Davide. - In: COMMUNICATIONS MATERIALS. - ISSN 2662-4443. - 5:1(2024). [10.1038/s43246-024-00497-1]

Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions

Satariano, Roberta
;
Ahmad, Halima Giovanna;Di Palma, Luigi;Ferraiuolo, Raffaella;Montemurro, Domenico;Parlato, Loredana;Pepe, Giovanni Piero;Tafuri, Francesco;Ausanio, Giovanni;Massarotti, Davide
2024

Abstract

Magnetic Josephson junctions (MJJs) have emerged as a prominent playground to explore the interplay between superconductivity and ferromagnetism. A series of fascinating experiments have revealed striking phenomena at the superconductor/ferromagnet (S/F) interface, pointing to tunable phase transitions and to the generation of unconventional spin-triplet correlations. Here, we show that the Josephson effect, being sensitive to phase space variation on the nanoscale, allows a direct observation of the spin polarization of the S/F interface. By measuring the temperature dependence of the Josephson magnetic field patterns of tunnel MJJs with strong and thin F-layer, we demonstrate an induced nanoscale spin order in S along the superconducting coherence length at S/F interface, i.e., the inverse proximity effect, with the first evidence of full spin screening at very low temperatures, as expected by the theory. A comprehensive phase diagram for spin nanoscale ordering regimes at S/F interfaces in MJJs has been derived in terms of the magnetic moment induced in the S-layer. Our findings contribute to drive the design and the tailoring of S/F interfaces also in view of potential applications in quantum computing.
2024
Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions / Satariano, Roberta; Volkov, Anatoly Fjodorovich; Ahmad, Halima Giovanna; Di Palma, Luigi; Ferraiuolo, Raffaella; Vettoliere, Antonio; Granata, Carmine; Montemurro, Domenico; Parlato, Loredana; Pepe, Giovanni Piero; Tafuri, Francesco; Ausanio, Giovanni; Massarotti, Davide. - In: COMMUNICATIONS MATERIALS. - ISSN 2662-4443. - 5:1(2024). [10.1038/s43246-024-00497-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/959628
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