Control of spin-orbit torque-driven domain nucleation through geometry in chirally coupled magnetic tracks

Abstract

The interfacial Dzyaloshinskii-Moriya interaction (DMI) can be exploited in magnetic thin films to realize lateral chirally coupled systems, providing a way to couple different sections of a magnetic racetrack and realize interconnected networks of magnetic logic gates. Here, we systematically investigate the interplay between spin-orbit torques, chiral coupling and the device design in domain wall racetracks. We show that the current-induced domain nucleation process can be tuned between single-domain nucleation and repeated nucleation of alternate domains by changing the orientation of an in-plane patterned magnetic region within an out-of-plane magnetic racetrack. Furthermore, by combining experiments and micromagnetic simulations, we show that the combination of damping-like and field-like spin-orbit torques with DMI results in selective domain wall injection in one of two arms of a Y-shaped devices depending on the current density. Such an element constitutes the basis of domain wall based demultiplexer, which is essential for distributing a single input to any one of the multiple outputs in logic circuits. Our results provide input for the design of reliable and multifunctional domain-wall circuits based on chirally coupled interfaces.

References in corpus (9)

• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Anomalous spin-orbit torque switching due to field-like torque-assisted domain wall reflection
• Synthetic chiral magnets promoted by the Dzyaloshinskii-Moriya interaction
• Effects of Oxidation of Top and Bottom Interfaces on the Electric, Magnetic, and Spin-Orbit Torque Properties of Pt/Co/AlOx Trilayers
• Field- and current-driven magnetic domain-wall inverter and diode
• Asymmetric velocity and tilt angle of domain walls induced by spin-orbit torques
• Synchronization of chiral vortex nano-oscillators
• Electrically programmable magnetic coupling in an Ising network exploiting solid-state ionic gating
• Engineering of Intrinsic Chiral Torques in Magnetic Thin Films Based on the Dzyaloshinskii-Moriya Interaction