Survey of 360${}^{\circ }$ domain walls in magnetic heterostructures: topology, chirality and current-driven dynamics

Abstract

Chirality and current-driven dynamics of topologically nontrivial 360${}^{\circ }$ domain walls (360DWs) in magnetic heterostructures (MHs) are systematically investigated. For MHs with normal substrates, the static 360DWs are Néel-type with no chirality. While for those with heavy-metal substrates, the interfacial Dzyaloshinskii-Moriya interaction (iDMI) therein makes 360DWs prefer specific chirality. Under in-plane driving charge currents, as the direct result of "full-circle" topology a certain 360DW does not undergo the "Walker breakdown"-type process like a well-studied 180${}^{\circ }$ domain wall as the current density increases. Alternatively, it keeps a fixed propagating mode (either steady-flow or precessional-flow, depending on the effective damping constant of the MH) until it collapses or changes to other types of solition when the current density becomes too high. Similarly, the field-like spin-orbit torque (SOT) has no effects on the dynamics of 360DWs, while the anti-damping SOT has. For both modes, modifications to the mobility of 360DWs by iDMI and anti-damping SOT are provided.

arXiv comment9 pages, 4 figures

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Cited by in corpus (5)

• Barkhausen noise from formation of 360${}^{\circ }$ domain walls in disordered permalloy thin films
• Stabilizing current-driven steady flows of 180${}^{\circ }$ domain walls in spin valves by interfacial Dzyaloshinskii-Moriya interaction
• Chiral domain wall dynamics in magnetic heterostructures with bulk Dzyaloshinskii-Moriya interactions
• Slonczewski-spin-current driven dynamics of 180${}^{\circ }$ domain walls in spin valves with interfacial Dzyaloshinskii-Moriya interaction
• Spin-wave Goos-Hänchen effect induced by 360 degree domain walls in magnetic heterostructures