Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys

Abstract

Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty in experimentally probing such rapid dynamics. Here, we find evidence of rapid magnetic order recovery in materials with perpendicular magnetic anisotropy via nonlinear magnon processes. We identify both localisation and coalescence regimes, whereby localised magnetic textures nucleate and subsequently evolve in accordance with a power law formalism. Coalescence is observed for optical excitations both above and below the switching threshold. Simulations indicate that the ultrafast generation of noncollinear magnetisation via optical pumping establishes exchange-mediated spin currents with an equivalent 100% spin polarised charge current density of $10^8$ A/cm${}^2$. Such large spin currents precipitate rapid recovery of magnetic order after optical pumping. These processes suggest an ultrafast optical route for the stabilization of desired meta-stable states, e.g., isolated skyrmions.

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• Unifying femtosecond and picosecond single-pulse magnetic switching in GdFeCo
• Emergence of Transient Domain Wall Skyrmions after Ultrafast Demagnetisation
• Coupling phenomena and collective effects in resonant meta-molecules supporting plasmonic and magnetic functionalities: a review
• Universal criteria for single femtosecond pulse ultrafast magnetization switching in ferrimagnets
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• Simultaneous two-color snapshot view on ultrafast charge and spin dynamics in a Fe-Cu-Ni tri-layer
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• Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL
• Ultrafast Opto-magnetic Effects in the Extreme Ultraviolet Spectral Range
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• Ultrafast Laser-Induced Magnetic Relaxation in Artificial Spin Ice Driven by Dipolar Interactions