Magnetic-field-controlled positioning of magnetic domain wall in Tie-shaped asymmetric nanowire and its application for magnetic field detection

Abstract

As a topological spin texture, magnetic domain walls have soliton-like dynamic behaviors in magnetic nanowires, which can be used in information transmission and storage technology. Therefore, precisely controlling the dynamic behavior of the magnetic domain wall and its pinning behavior is one of the important technical challenges in realizing the domain-wall-based spintronic devices. In this work, a geometrically defect-free scheme for the domain wall pinning/depinning is proposed by micromagnetic simulations based on a tie-shaped asymmetric nanowire, which can be precisely control the position of the magnetic domain wall under the external magnetic field. The results show that the domain wall in the tie-shaped nanowires exhibit excellent linear response and ultrafast time response characteristics to external magnetic fields, which endow them with enormous potential applications for high-frequency weak magnetic field detection. We further propose a scheme for constructing a magnetic field sensor using the tie structured nanowire and study its feasibility.