Brownian Motion and Entropic Torque Driven Motion of Domain-Wall in Antiferromagnets

Abstract

We study the spin dynamics in antiferromagnetic nanowire under an applied temperature gradient using micromagnetic simulations on a classical spin model with a uniaxial anisotropy. The entropic torque driven domain-wall motion and the Brownian motion are discussed in detail, and their competition determines the antiferromagnetic wall motion towards the hotter or colder region. Furthermore, the spin dynamics in an antiferromagnet can be well tuned by the anisotropy and the temperature gradient. Thus, this paper not only strengthens the main conclusions obtained in earlier works [Kim et al., Phys. Rev. B 92, 020402(R) (2015); Selzer et al., Phys. Rev. Lett. 117, 107201 (2016)], but more importantly gives the concrete conditions under which these conclusions apply, respectively. Our results may provide useful information on the antiferromagnetic spintronics for future experiments and storage device design.

arXiv comment6 pages, 7 figures, published in Physical Review B

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Cited by in corpus (10)

• Ultrafast generation and dynamics of isolated skyrmions in antiferromagnetic insulators
• Ultrafast domain wall motion in ferrimagnets induced by magnetic anisotropy gradient
• Driving a magnetized domain wall in an antiferromagnet by magnons
• Ultrafast depinning of domain wall in notched antiferromagnetic nanostructures
• Microwave fields driven domain wall motions in antiferromagnetic nanowires
• Ultralow-loss domain wall motion driven by magnetocrystalline anisotropy gradient in antiferromagnetic nanowire
• The Landau-Lifshitz-Bloch equation for domain wall motion in antiferromagnets
• Rotating magnetic field driven antiferromagnetic domain wall motion: Role of Dzyaloshinskii-Moriya interaction
• Staggered field driven domain walls motion in antiferromagnetic heterojunctions
• Controllable dispersion of domain wall movement in antiferromagnetic thin films at finite temperatures