Flux trapping in NbTiN strips
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914048043384832 |
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| author | Bai, Ruiheng Sepehri, Aliakbar Valente-Feliciano, Anne-Marie Herr, Anna Herr, Quentin Loh, Yen-Lee Nowack, Katja C. |
| author_facet | Bai, Ruiheng Sepehri, Aliakbar Valente-Feliciano, Anne-Marie Herr, Anna Herr, Quentin Loh, Yen-Lee Nowack, Katja C. |
| contents | We use scanning superconducting quantum interference device (SQUID) microscopy to image vortices in superconducting strips fabricated from NbTiN thin films. We repeatedly cool superconducting strips with different width in an applied magnetic field and image the individual vortices. From these images we determine the threshold field at which the first vortex enters a strip, as well as the number and spatial configuration of vortices beyond this threshold field. We model vortex behavior with and without considering the effect of pinning by numercially minimizing the Gibbs free energy of vortices in the strips. Our measurements provide a first benchmark to understand the flux trapping properties of NbTiN thin films directly relevant to NbTiN-based superconducting circuits and devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14457 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flux trapping in NbTiN strips Bai, Ruiheng Sepehri, Aliakbar Valente-Feliciano, Anne-Marie Herr, Anna Herr, Quentin Loh, Yen-Lee Nowack, Katja C. Superconductivity We use scanning superconducting quantum interference device (SQUID) microscopy to image vortices in superconducting strips fabricated from NbTiN thin films. We repeatedly cool superconducting strips with different width in an applied magnetic field and image the individual vortices. From these images we determine the threshold field at which the first vortex enters a strip, as well as the number and spatial configuration of vortices beyond this threshold field. We model vortex behavior with and without considering the effect of pinning by numercially minimizing the Gibbs free energy of vortices in the strips. Our measurements provide a first benchmark to understand the flux trapping properties of NbTiN thin films directly relevant to NbTiN-based superconducting circuits and devices. |
| title | Flux trapping in NbTiN strips |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.14457 |