# Switching speed of DCL-gates with high-J /SUB c/ Josephson junctions

## Abstract

Switching speed and bias current margin of DCL-gates composed of high-J /SUB c/ junctions are investigated by both numerical calculation and experimental measurement. It is shown that switching speed is improved by increasing J /SUB c/ . However, the switching speed and bias current margin of DCL-gates are restricted by the increase in the minimum resetting current for the high-J /SUB c/ junction. The theoretical J /SUB c/ limit for a Nb oxide barrier junction is found to be about 7 X 10/sup 8/ A/m/sup 2/ from numerical results, and the J /SUB c/ values that produce bias current margins of greater than 20 % are found by both numerical and experimental results to be less than 2 about 3 X 10/sup 8/ A/m/sup 2/. The switching delay obtained experimentally for a DCL-gate with a J /SUB c/ value of 2 X 10/sup 8/ A/m/sup 2/ is 5.6 ps, which is in good agreement with the numerical result.

- Authors:

- Publication Date:

- Research Org.:
- Central Research Laboratory, Hitachi, Ltd., Kokubunji 185, Tokyo

- OSTI Identifier:
- 6485609

- Alternate Identifier(s):
- OSTI ID: 6485609

- Report Number(s):
- CONF-840937-

Journal ID: CODEN: IEMGA

- Resource Type:
- Conference

- Resource Relation:
- Journal Name: IEEE Trans. Magn.; (United States); Journal Volume: MAG-21:2; Conference: Applied superconductivity conference, San Diego, CA, USA, 9 Sep 1984

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GATING CIRCUITS; PERFORMANCE; TIMING PROPERTIES; LOGIC CIRCUITS; JOSEPHSON JUNCTIONS; SWITCHING CIRCUITS; ELECTRONIC CIRCUITS; JUNCTIONS; SUPERCONDUCTING JUNCTIONS 420201* -- Engineering-- Cryogenic Equipment & Devices

### Citation Formats

```
Nishino, T., Hatano, Y., Kawabe, U., and Tarutani, Y..
```*Switching speed of DCL-gates with high-J /SUB c/ Josephson junctions*. United States: N. p., 1985.
Web.

```
Nishino, T., Hatano, Y., Kawabe, U., & Tarutani, Y..
```*Switching speed of DCL-gates with high-J /SUB c/ Josephson junctions*. United States.

```
Nishino, T., Hatano, Y., Kawabe, U., and Tarutani, Y.. Fri .
"Switching speed of DCL-gates with high-J /SUB c/ Josephson junctions". United States.
doi:.
```

```
@article{osti_6485609,
```

title = {Switching speed of DCL-gates with high-J /SUB c/ Josephson junctions},

author = {Nishino, T. and Hatano, Y. and Kawabe, U. and Tarutani, Y.},

abstractNote = {Switching speed and bias current margin of DCL-gates composed of high-J /SUB c/ junctions are investigated by both numerical calculation and experimental measurement. It is shown that switching speed is improved by increasing J /SUB c/ . However, the switching speed and bias current margin of DCL-gates are restricted by the increase in the minimum resetting current for the high-J /SUB c/ junction. The theoretical J /SUB c/ limit for a Nb oxide barrier junction is found to be about 7 X 10/sup 8/ A/m/sup 2/ from numerical results, and the J /SUB c/ values that produce bias current margins of greater than 20 % are found by both numerical and experimental results to be less than 2 about 3 X 10/sup 8/ A/m/sup 2/. The switching delay obtained experimentally for a DCL-gate with a J /SUB c/ value of 2 X 10/sup 8/ A/m/sup 2/ is 5.6 ps, which is in good agreement with the numerical result.},

doi = {},

journal = {IEEE Trans. Magn.; (United States)},

number = ,

volume = MAG-21:2,

place = {United States},

year = {Fri Mar 01 00:00:00 EST 1985},

month = {Fri Mar 01 00:00:00 EST 1985}

}