| Presentation | 2017-04-21 Fabrication of ferromagnetic Josephson junctions for Superconducting digital circuit application Tomohiro Kamiya, Takuya Kurihara, Soya Taniguchi, Hiroshi Ito, Hiroyuki Akaike, Akira Fujimaki, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We fabricated Josephson junctions with ferromagnetic layer (superconductor/ferromagnetic/insulator/superconductor, SFIS Josephson junctions), in which phase difference between superconductor electrodes could shift by π by exchange interaction in the ferromagnetic layer. The electronical characteristics of SFIS Josephson junctions are known to be extremely sensitive to the ferromagnetic layer. Assuming switching device in circuit applications, it is required that 0- and π-Josephson junctions be distinctively fabricated, have high critical current density and fast switching speed, and achieve small spreads acceptable for large-scale integration. In this paper, we present dependence of SFIS junction characteristics on the ferromagnetic layer thickness and spreads of critical currents. We use PdNi alloy (Ni ratio: 11%) as a ferromagnetic layer. Our experimental results showed that the critical current density decreased exponentially as the thickness of the ferromagnetic layer increases, and that π junctions were obtained with a 7-nm and 9-nm thick layer. We also found the spreads of critical currents, 1σ was below 2%, which suggested that ferromagnetic Josephson junctions can be applied for very large-scale integrated circuits. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Ferromagnetic Josephson junction / π junction / IcRs product |
| Paper # | SCE2017-4 |
| Date of Issue | 2017-04-14 (SCE) |
| Conference Information | |
| Committee | SCE |
|---|---|
| Conference Date | 2017/4/21(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kikai-Shinko-Kaikan Bldg. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Devices, Thin film, etc. |
| Chair | Nobuyuki Yoshikawa(Yokohama National Univ.) |
| Vice Chair | |
| Secretary | (National Defense Academy) |
| Assistant | Hiroyuki Akaike(Nagoya Univ.) / Yuki Yamanashi(Yokohama National Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Superconductive Electronics |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Fabrication of ferromagnetic Josephson junctions for Superconducting digital circuit application |
| Sub Title (in English) | |
| Keyword(1) | Ferromagnetic Josephson junction |
| Keyword(2) | π junction |
| Keyword(3) | IcRs product |
| 1st Author's Name | Tomohiro Kamiya |
| 1st Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 2nd Author's Name | Takuya Kurihara |
| 2nd Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 3rd Author's Name | Soya Taniguchi |
| 3rd Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 4th Author's Name | Hiroshi Ito |
| 4th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 5th Author's Name | Hiroyuki Akaike |
| 5th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 6th Author's Name | Akira Fujimaki |
| 6th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| Date | 2017-04-21 |
| Paper # | SCE2017-4 |
| Volume (vol) | vol.117 |
| Number (no) | SCE-10 |
| Page | pp.pp.17-22(SCE), |
| #Pages | 6 |
| Date of Issue | 2017-04-14 (SCE) |