Magnetic field computation in superconducting thin film structures by a volume integral equation method

We present a method to calculate the current density distribution, the magnetic field distribution and the inductance matrix of three dimensional superconducting structures by minimizing the free energy. In the case of high-T/sub c/ superconductors, the kinetic inductance becomes substantial and an accurate calculation of inductances is required. The London penetration depth /spl lambda/ and the kinetic inductance are included. The results of a program which realizes this method agree well with measurements of high-T/sub c/ dc-SQUIDs (superconducting quantum interference devices).