Exploring the Fundamental Spatial Limits of Magnetic All-Optical Switching.

Autor: Steinbach F; Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany., Atxitia U; Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain., Yao K; Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany., Borchert M; Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany., Engel D; Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany., Bencivenga F; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Foglia L; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Mincigrucci R; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Pedersoli E; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., De Angelis D; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Pancaldi M; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Fainozzi D; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Pelli Cresi JS; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Paltanin E; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Capotondi F; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Masciovecchio C; Elettra Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy., Eisebitt S; Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany.; Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany., von Korff Schmising C; Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born Strasse 2A, 12489 Berlin, Germany.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2024 Jun 12; Vol. 24 (23), pp. 6865-6871. Date of Electronic Publication: 2024 May 29.
DOI: 10.1021/acs.nanolett.4c00129
Abstrakt: All-optical switching (AOS) results in ultrafast and deterministic magnetization reversal upon single laser pulse excitation, potentially supporting faster and more energy-efficient data storage. To explore the fundamental limits of achievable bit densities in AOS, we have used soft X-ray transient grating spectroscopy to study the ultrafast magnetic response of a GdFe alloy after a spatially structured excitation with a periodicity of 17 nm. The ultrafast spatial evolution of the magnetization in combination with atomistic spin dynamics and microscopic temperature model calculations allows us to derive a detailed phase diagram of AOS as a function of both the absorbed energy density and the nanoscale excitation period. Our results suggest that the minimum size for AOS in GdFe alloys, induced by a nanoscale periodic excitation, is around 25 nm and that this limit is governed by ultrafast lateral electron diffusion and by the threshold for optical damage.
Databáze: MEDLINE
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