Controllable dispersion of domain wall movement in antiferromagnetic thin films at finite temperatures

Abstract

The dynamics of a 90${}^{\circ }$ domain wall in an antiferromagnetic nanostrip driven by the current-induced spin-orbital torque are theoretically examined in the presence of random thermal fluctuations. A soliton-type equation of motion is developed on the basis of energy balance between the driving forces and dissipative processes in terms of the domain wall velocity. Comparison with micromagnetic simulations in the deterministic conditions shows good agreement in both the transient and steady-state transport. When the effects of random thermal fluctuations are included via a stochastic treatment, the results clearly indicate that the dispersion in the domain wall position can be controlled electrically by tailoring the strength and duration of the driving current mediating the spin orbital torque in the antiferromagnet. More specifically, the standard deviation of the probability distribution function for the domain wall movement can be tuned widely while maintaining the average position unaffected. Potential applications of this unusual functionality include the probabilistic computing such as Bayesian learning.

References in corpus (17)

• Antiferromagnetic spintronics
• Writing and Reading antiferromagnetic Mn${}_2$Au: Néel spin-orbit torques and large anisotropic magnetoresistance
• Staggering antiferromagnetic domain wall velocity in a staggered spin-orbit field
• Antiferromagnetic domain wall motion driven by spin-orbit torques
• Phenomenology of Current-Induced Dynamics in Antiferromagnets
• Skyrmion Gas Manipulation for Probabilistic Computing
• Staggered Dynamics in Antiferromagnets by Collective Coordinates
• Electrical switching of antiferromagnetic Mn${}_2$Au and the role of thermal activation
• Antiferromagnetic Domain Wall Motion Induced by Spin Waves
• Current-polarity dependent manipulation of antiferromagnetic domains
• Propulsion of a domain wall in an antiferromagnet by magnons
• Concepts of antiferromagnetic spintronics
• Controlling Chiral Domain Walls in Antiferromagnets Using Spin-Wave Helicity
• Revealing Controllable Anisotropic Magnetoresistance in Spin Orbit Coupled Antiferromagnet Sr2IrO4
• Brownian Motion and Entropic Torque Driven Motion of Domain-Wall in Antiferromagnets
• Spin texture motion in antiferromagnetic and ferromagnetic nanowires
• Cross effect of magnetic field and charge current on antiferromagnetic dynamics