| Project/Area Number |
23656238
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Electron device/Electronic equipment
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2011 – 2012
|
| Project Status |
Completed (Fiscal Year 2012)
|
| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
|---|
| Keywords | 超伝導 / ナノブリッジ / 単一磁束量子回路 / ボルテックス / 磁束量子 / ダイオード / 整流素子 |
|---|
| Research Abstract |
We have studied on asymmetrical nano-bridges (ANBs) based on high-temperature superconducting films. The ANBs are expected to be act as a rectifier at high frequencies. The ANBs have "K" shapes in their geometry. Abrikosov vortices can enter the ANBs only at the constricted edges, so that the Ratchet effect appears at ANBs. The Ratchet effect leads to the reduction of the critical currents of ANBs under appropriate magnetic fields. We investigate the magnitude of the critical current reduction for different film thicknesses and different widths of ANBs. Experimental results show that the effective penetration depth is a key parameter to determine the characteristics of the ANBs. We also prepare SQUIDs consisting of two ANBs. We have observed long-term modulations in voltages generated across the SQUIDs together with periodic modulations when we increase applied magnetic fields. Although the large modulation depth of critical currents have not been observed, this result suggests that large reduction would be obtained afteroptimization of the circuit parameters.
|
