We studied superconducting to normal state current-driven transitions in Ferromagnetic Cobalt/Cobalt Oxide/Superconducting Indium stripes of widths ranging from 3 μm to 20 μm. The narrower stripes can be set up in a high or low critical current state by driving the magnetic domain structure of the thin Co film either in an almost uniform or non-uniform state of magnetization. In the first case in slightly sub critical currents there is a spontaneous superconducting to normal state transition. In the latter the transition is preceded by the development of normal domains. The spontaneous transition as well as the normal domains are triggered by flux jumps.
- Critical current
- Ferromagnetic superconducting layers
- Normal domains
- Spin switch