Asymmetric Ferromagnetic Resonance, Universal Walker Breakdown, and Counterflow Domain Wall Motion in the Presence of Multiple Spin-Orbit Torques

Abstract

We study the motion of several types of domain wall profiles in spin-orbit coupled magnetic nanowires and also the influence of spin-orbit interaction on the ferromagnetic resonance of uniform magnetic films. We extend previous studies by fully considering not only the field-like contribution from the spin-orbit torque, but also the recently derived Slonczewski-like spin-orbit torque. We show that the latter interaction affects both the domain wall velocity and the Walker breakdown threshold non-trivially, which suggests that it should be accounted in experimental data analysis. We find that the presence of multiple spin-orbit torques may render the Walker breakdown to be universal in the sense that the threshold is completely independent on the material-dependent Gilbert damping, non-adiabaticity, and the chirality of the domain wall. We also find that domain wall motion against the current injection is sustained in the presence of multiple spin-orbit torques and that the wall profile will determine the qualitative influence of these different types of torques (e.g. field-like and Slonczewski-like). In addition, we consider a uniform ferromagnetic layer under a current bias, and find that the resonance frequency becomes asymmetric against the current direction in the presence of Slonczewski-like spin-orbit coupling. This is in contrast with those cases where such an interaction is absent, where the frequency is found to be symmetric with respect to the current direction. This finding shows that spin-orbit interactions may offer additional control over pumped and absorbed energy in a ferromagnetic resonance setup by manipulating the injected current direction.

12 pages including 7 figures

References in corpus (7)

• Microscopic approach to current-driven domain wall dynamics
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
• Current-induced domain wall motion in Rashba spin-orbit system
• Spin wave assisted current induced magnetic domain wall motion
• Theory of Domain Wall Dynamics under Current
• High domain wall velocity at zero magnetic field induced by low current densities in spin-valve nanostripes

Cited by in corpus (10)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Berry phase theory of Dzyaloshinskii-Moriya interaction and spin-orbit torques
• Angular dependence of spin-orbit spin transfer torques
• Improved Domain Wall Dynamics and Magnonic Torques using Topological Insulators
• Current induced domain wall dynamics in the presence of spin orbit torques
• Walker breakdown with a twist: Dynamics of multilayer domain walls and skyrmions driven by spin-orbit torque
• Universal Absence of Walker Breakdown and Linear Current-Velocity Relation via Spin-Orbit Torques in Coupled and Single Domain Wall Motion
• Understanding current-driven dynamics of magnetic Néel walls in heavy metal/ferromagnetic metal/oxide trilayers
• Rashba induced chirality switching of domain walls and suppression of the Walker breakdown
• Nonlocal spin torques in Rashba quantum wires with steep magnetic textures