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

Conference · Sat Apr 27 00:00:00 EDT 2019 · Nature

OSTI ID:1505831

Loera, Maggie

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 108 A/cm2. 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.

• Research Organization: SLAC
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1505831
• Report Number(s): SLAC-PUB-17416
• Journal Information: Nature, Conference: IPAC2019
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY