Nonlinear current flow around artificial defects in YBCO epitaxial film has been investigated by use of scanning SQUID microscope. Two-dimensional local current flow around the transverse defects in the YBCO film has been visualized successfully from the magnetic self-field image. Experimental results showed good agreement with theoretical solution based on the Maxwell's equation along with nonlinear current-voltage characteristics. Present method allows us to measure the non-uniform current flow quantitatively under the influence of obstacles in the micro-meter length scale.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering