Field-free Josephson diode with controllable efficiency using magnetic tunnel barrier
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914561704067072 |
|---|---|
| author | Sharma, Pramod K. Banerjee, Sagnik Dutta, Biswajit Singhal, Vansh Banerjee, Pushpak Pal, Hridis K. Pal, Avradeep |
| author_facet | Sharma, Pramod K. Banerjee, Sagnik Dutta, Biswajit Singhal, Vansh Banerjee, Pushpak Pal, Hridis K. Pal, Avradeep |
| contents | Josephson diodes (JDs) offer a promising route towards realizing dissipation-less rectification at low temperatures. To be practically viable, a JD must operate at zero magnetic fields, exhibit high operating frequencies and efficiency, and possess tunability and scalability. In this study, we propose and experimentally demonstrate a straightforward mechanism that encompasses all these crucial features. Our approach involves utilizing an asymmetric Josephson junction with a magnetic weak link to attain a diode effect in the switching current. We substantiate this concept experimentally through the fabrication of mesa-type sputter-deposited tri-layered ferromagnetic long NbN/GdN/NbN Josephson junctions (JJs) in cross geometry. A robust zero-field diode effect is observed with an efficiency boost of up to 40% achievable through modification of the micromagnetic structure of the barrier. Notably, these diodes maintain high efficiency across a wide temperature range, from the lowest temperatures up to at least 4.2K, and exhibit an operating frequency of nearly 28GHz. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_04650 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Field-free Josephson diode with controllable efficiency using magnetic tunnel barrier Sharma, Pramod K. Banerjee, Sagnik Dutta, Biswajit Singhal, Vansh Banerjee, Pushpak Pal, Hridis K. Pal, Avradeep Superconductivity Josephson diodes (JDs) offer a promising route towards realizing dissipation-less rectification at low temperatures. To be practically viable, a JD must operate at zero magnetic fields, exhibit high operating frequencies and efficiency, and possess tunability and scalability. In this study, we propose and experimentally demonstrate a straightforward mechanism that encompasses all these crucial features. Our approach involves utilizing an asymmetric Josephson junction with a magnetic weak link to attain a diode effect in the switching current. We substantiate this concept experimentally through the fabrication of mesa-type sputter-deposited tri-layered ferromagnetic long NbN/GdN/NbN Josephson junctions (JJs) in cross geometry. A robust zero-field diode effect is observed with an efficiency boost of up to 40% achievable through modification of the micromagnetic structure of the barrier. Notably, these diodes maintain high efficiency across a wide temperature range, from the lowest temperatures up to at least 4.2K, and exhibit an operating frequency of nearly 28GHz. |
| title | Field-free Josephson diode with controllable efficiency using magnetic tunnel barrier |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2312.04650 |