Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions
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arXiv
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2025
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| author | 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 |
| author_facet | 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 |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09175 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | 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 Superconductivity 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. |
| title | Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.09175 |