Current induced generation and synchronous motion of highly packed coupled chiral domain walls

Abstract

Chiral domain walls of Neel type emerge in heterostructures that include heavy metal (HM) and ferromagnetic metal (FM) layers owing to the Dzyaloshinskii-Moriya (DM) interaction at the HM/FM interface. In developing storage class memories based on the current induced motion of chiral domain walls, it remains to be seen how dense such domain walls can be packed together. Here we show that a universal short range repulsion that scales with the strength of the DM interaction exists among chiral domain walls. The distance between the two walls can be reduced with application of out of plane field, allowing formation of coupled domain walls. Surprisingly, the current driven velocity of such coupled walls is independent of the out of plane field, enabling manipulation of significantly compressed coupled domain walls using current pulses. Moreover, we find that a single current pulse with optimum amplitude can create a large number of closely spaced domain walls. These features allow current induced generation and synchronous motion of highly packed chiral domain walls, a key feature essential for developing domain wall based storage devices.

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• Determination of the Dzyaloshinskii-Moriya interaction using pattern recognition and machine learning
• Current-driven domain wall dynamics in ferromagnetic layers synthetically exchange-coupled by a spacer: A micromagnetic study
• Current-driven domain wall motion along ferromagnetic strips with periodically-modulated perpendicular anisotropy
• Shock-wave-like emission of spin waves induced by interfacial Dzyaloshinskii-Moriya interaction
• Domain Wall Motion in Magnetic Nanostrips
• Control of spin-orbit torque-driven domain nucleation through geometry in chirally coupled magnetic tracks
• Geometrical design for pure current-driven domain wall nucleation and shifting