Magnetically Induced Switching-Current Jumps in InAs/Al Josephson Junctions
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866910089869262848 |
|---|---|
| author | Durante, Ofelia Citro, Roberta Strambini, Elia Demontis, Valeria Rocci, Mirko Braggio, Alessandro Battiato, Sergio Zannier, Valentina Sorba, Lucia Giazotto, Francesco Guarcello, Claudio |
| author_facet | Durante, Ofelia Citro, Roberta Strambini, Elia Demontis, Valeria Rocci, Mirko Braggio, Alessandro Battiato, Sergio Zannier, Valentina Sorba, Lucia Giazotto, Francesco Guarcello, Claudio |
| contents | We report Barkhausen-like switching at millitesla fields in an $n$-doped InAs/Al nanowire Josephson junction, which serves as an interferometric probe of intrinsic magnetic reconfigurations, as evidenced by discrete switching-current jumps. At $T=30$~mK the device displays a Fraunhofer-like modulation with $I_{\mathrm{sw}}(0)\approx 0.24~μ\mathrm{A}$ and an abrupt transition at $|B|\approx 3~\mathrm{mT}$ between two branches differing by $ΔI_{\mathrm{sw}}\approx 0.13~μ\mathrm{A}$. By tracking the characteristic field scales from $30$ to $900$~mK, we find that the jump field is essentially temperature-independent, whereas the superconducting critical field decreases with temperature, as expected for thin Al films. The sharp discontinuity, sweep-direction asymmetry, and reproducibility across repeated scans point to avalanche-like switching between metastable magnetic configurations of the local magnetic texture, which are directly coupled to the weak link. Within an effective-field framework, each reconfiguration modifies a local field offset, thereby reshaping the interference response and leading to an abrupt reorganization of the switching-current pattern. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_29757 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetically Induced Switching-Current Jumps in InAs/Al Josephson Junctions Durante, Ofelia Citro, Roberta Strambini, Elia Demontis, Valeria Rocci, Mirko Braggio, Alessandro Battiato, Sergio Zannier, Valentina Sorba, Lucia Giazotto, Francesco Guarcello, Claudio Mesoscale and Nanoscale Physics Superconductivity We report Barkhausen-like switching at millitesla fields in an $n$-doped InAs/Al nanowire Josephson junction, which serves as an interferometric probe of intrinsic magnetic reconfigurations, as evidenced by discrete switching-current jumps. At $T=30$~mK the device displays a Fraunhofer-like modulation with $I_{\mathrm{sw}}(0)\approx 0.24~μ\mathrm{A}$ and an abrupt transition at $|B|\approx 3~\mathrm{mT}$ between two branches differing by $ΔI_{\mathrm{sw}}\approx 0.13~μ\mathrm{A}$. By tracking the characteristic field scales from $30$ to $900$~mK, we find that the jump field is essentially temperature-independent, whereas the superconducting critical field decreases with temperature, as expected for thin Al films. The sharp discontinuity, sweep-direction asymmetry, and reproducibility across repeated scans point to avalanche-like switching between metastable magnetic configurations of the local magnetic texture, which are directly coupled to the weak link. Within an effective-field framework, each reconfiguration modifies a local field offset, thereby reshaping the interference response and leading to an abrupt reorganization of the switching-current pattern. |
| title | Magnetically Induced Switching-Current Jumps in InAs/Al Josephson Junctions |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2603.29757 |