Towards precise measurement of oscillatory domain wall by ferromagnetic Josephson junction
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 V=n(ℏ/2e)ωDW with the fundamental constant ℏ/e, integer number n, and the DW frequency ωDW. Since V can be determined in the order of 10−9 accuracy, the oscillatory DW will be measured more precisely than present status by conventional method.