Reversible magnetic spiral domain

Abstract

The various spiral structures that exist in nature inspire humanity because of their morphological beauty, and spiral structures are used in various fields, including architecture, engineering, and art. Spiral structures have their own winding directions, and in most spirals, it is difficult to reverse the predetermined winding direction. Here, we show that a rotating spiral exists in magnetic systems for which the winding direction can be easily reversed. A magnetization vector basically has a spiral motion combining a precessional and a damping motion. The application of these basic mechanics to a system composed of magnetic vectors that are affected by a radial current and the Dzyaloshinskii–Moriya interaction forms the rotating magnetic spiral. The winding direction of the magnetic spiral has its own stability, but the direction can be changed using an external magnetic field. This magnetic spiral has a finite size, and the magnetic domain is destroyed at the edge of the spiral, which can create magnetic skyrmions.

Superposition principle with Ampère’s law and a semi-infinite wire

“…The hemispherical spread is commonly used to model the current distribution in a homogeneous soil when measuring its resistivity [14]. Meanwhile, the radial flow of current on a two-dimensional plane in a conductor coated with a magnetic layer can generate a magnetic spiral [15]. Our focus is on understanding the impact of these various current configurations on the magnetic field.…”