Three terminal nano-oscillator based on domain wall pinning by track defect and anisotropy control

Abstract

The proper understanding of the dynamical properties of magnetization collective modes is a cornerstone for future applications in spintronic devices based on the domain wall (DW) motion. In this work, through micromagnetic simulations and analytical calculations, we study the rotation of a DW pinned by a T-shaped defect on an anisotropic magnetic nanostripe. We show that the competition between the torques produced by the magnetostatic field generated by the T-shaped defect and the applied electric current makes the DW stop at a specific position along the track, and start to turn around the in-plane direction with a specific rotation frequency depending on anisotropy and current density. It is also shown that the distance between the DW position and the T-shaped structure position depends on the anisotropy constant of the nanostripe. Finally, it is proposed as an experimental setting considering that the DW rotation mode can be used to induce the rotation of magnetization of a magnetic nanodisc by a magnetic tunnel junction device. We have then shown that this experimental arrangement can be considered as a three-terminal nano-oscillator.