Towards precise measurement of oscillatory domain wall by ferromagnetic Josephson junction

Hikino, Shinichi*; Mori, Michiyasu  ; Koshibae, Wataru*; Maekawa, Sadamichi

We theoretically propose a principle for precise measurement of oscillatory domain wall (DW) by a ferromagnetic Josephson junction, which is composed of a ferromagnetic wire with DW and two superconducting electrodes. The current-voltage curve exhibits stepwise structures, only when DW oscillates in the ferromagnetic wire. The voltage step appears at = (/2) with the fundamental constant /, integer number , and the DW frequency . Since can be determined in the order of 10 accuracy, the oscillatory DW will be measured more precisely than present status by conventional method.