Spatiotemporal observation of surface plasmon polariton mediated ultrafast demagnetization.

ABSTRACT: Surface plasmons offer a promising avenue in the pursuit of swift and localized manipulation of magnetism for advanced magnetic storage and information processing technology. However, observing and understanding spatiotemporal interactions between surface plasmons and spins remains challenging, hindering optimal optical control of magnetism. Here, we demonstrate the spatiotemporal observation of patterned ultrafast demagnetization dynamics in permalloy mediated by propagating surface plasmon polaritons with sub-picosecond time- and sub-μm spatial- scales by employing Lorentz ultrafast electron microscopy combined with excitation through transient optical gratings. We discover correlated spatial distributions of demagnetization amplitude and surface plasmon polariton intensity, the latter c

SUBMITTER: Fan Y 

PROVIDER: S-EPMC11756397 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature