Angular dependence of coercivity in magnetic nanotubes

TL;DR

This paper investigates how the coercivity of magnetic nanotubes varies with the angle of an applied magnetic field, revealing a transition in reversal modes and the influence of internal radii on magnetization behavior.

Contribution

It extends the understanding of angular dependence of coercivity in magnetic nanotubes, including a transition between reversal modes and the effect of geometric parameters.

Findings

Transition from curling-mode to coherent-mode rotation with angle

Internal radii favor curling reversal

Calculated nucleation field as a function of geometry

Abstract

The nucleation field for infinite magnetic nanotubes, in the case of a magnetic field applied parallel to the long axis of the tubes, is calculated as a function of their geometric parameters and compared with those produced inside the pores of anodic alumina membranes by atomic layer deposition. We also extended this result to the case of an angular dependence. We observed a transition from curling-mode rotation to coherent-mode rotation as a function of the angle in which the external magnetic field is applied. Finally, we observed that the internal radii of the tubes favors the magnetization curling reversal.