Perspective on basic architectures and properties of unconventional and Field Induced Josephson junction devices

We present the concept of unconventional and Field Induced Josephson junction (uJJ and FIJJ) and devices built from them. They can be made by placement of ferromagnetic strip on top of a superconducting strip. In such case modulation of superconducting order parameter and magnetization is obtained. Furthermore we can build tunable Josephson junction arrays, which can be tuned by applying external magnetic field to some circuit element(s). We present the superconducting order parameter distributions obtained from extended Ginzburg-Landau functional, which includes the coexistence of superconducting order parameter and magnetization. We present the case of SQUID built in uJJ and FIJJ architecture and current limiter.