Towards precise measurement of oscillatory domain wall by ferromagnetic Josephson junction

TL;DR

This paper proposes a theoretical method to measure oscillatory domain walls in ferromagnetic wires with high precision using a ferromagnetic Josephson junction, leveraging voltage steps related to DW oscillation frequency.

Contribution

It introduces a novel principle for precise DW measurement based on voltage steps in Josephson junctions, improving accuracy over conventional methods.

Findings

Voltage steps occur at V = n(/2e)_DW when DW oscillates.

Measurement accuracy of DW frequency can reach 10^9.

Method enables more precise DW measurement than current techniques.

Abstract

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(\hbar/2e)\omega_DW with the fundamental constant \hbar/e, integer number n, and the DW frequency \omega_DW. 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.