2018/09/30 by Rohollah Khoshlahni, Alireza Qaiumzadeh, Anders Bergman +1 · 1 citation
Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Ferromagnetism #Laser #Magnetic field #Magnetic properties of thin films #Metastability #Optics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Skyrmion #Spin (aerodynamics) #Theoretical and Computational Physics #Ultrashort pulse #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.99.054423
published as Phys. Rev. B 99, 054423 (2019) · 9 pages, 4 figures
arxiv created 2019/02/21 · openalex publication_date 2019/02/21 · arxiv updated 2019/02/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Based on atomistic spin dynamics simulations, we report the ultrafast generation of single antiferromagnetic (AFM) skyrmions in a confined geometry. This process is achieved through an effective magnetic field induced by the athermal inverse Faraday effect from a short laser pulse. The resulting field can nucleate an isolated skyrmion as a topologically protected metastable state in a collinear antiferromagnet with small Dzyaloshinskii-Moriya interaction. The radius of a single skyrmion is shown to increase by applying a uniform dc magnetic field and at increasing temperature. To investigate possible AFM spin-caloritronics phenomena, we investigate the skyrmion dynamics under an applied temperature gradient both analytically and numerically. The antiferromagnetic skyrmions move longitudinally toward the hotter region, but in contrast, small skyrmions in the very low damping regime move toward the colder side, irrespective of the staggered topological charge number, with a speed that is much faster than that of their ferromagnetic counterparts.