Magnetic Recording Systems: Magnetic Domain Walls Dynamic Due To Spin Transfer Torque, Spin Orbit Torques and Applied Magnetic Field Simultaneously

Abstract

In this paper, the recording media is considered as nanowire where Domain Wall (DW) can move when a charge pulse current or a current density is injected. Using domain wall Kink Soliton profile, we investigate dynamics of magnetic domain wall while relying on the Landau-Lifshitz-Gilbert equation that will simultaneously take into account the Spin Transfer Torque with adiabatic and non-adiabatic contribution, the Spin Orbit Torque with Spin Hall Effect plus Rashba effect, the applied external magnetic field and Dzyaloshinskii-Moriya interaction. The impact and the influence of all these micro-phenomena taken separately or simultaneously on the speed of domain wall propagation is observed through the analytical and numerical tools such as the collectives coordinates method and the fourth-order Runge-Kutta algorithm. This allows us to define the different propagation regimes of domain wall within the magnetic chain with different range of speed amount attained by domain wall during the propagation. In addition to the effects of applied magnetic field and the Spin Transfer Torque, we have also shown that the DMI interaction, Spin Hall Effect, Rashba effect and the Slonczewski effect can also significantly influence the stability of the wall during its propagation. According to a certain phenomenon, the speed of 400 m∕s is observed even that the normal propagation regime in those cases is very brief. In addition, to avoid the uncontrollable joule effect in the magnetic nanowire and to allow a better propagation of the wall under Spin Transfer Torque the current density would be around 10 8 A.m −2 .