Exploring the Fundamental Spatial Limits of Magnetic All-Optical Switching

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...

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Detalles Bibliográficos
Autores: Steinbach, F., Atxitia, U., Yao, K., Borchert, M., Engel, D., Bencivenga, F., Foglia, L., Mincigrucci, R., Pedersoli, E., De Angelis, D., Pancaldi, M., Fainozzi, D., Pelli Cresi, J.S., Paltanin, E., Capotondi, F., Masciovecchio, C., Eisebitt, S., von Korff Schmising, C.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/393676
Acceso en línea:http://hdl.handle.net/10261/393676
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85194963893&doi=10.1021%2facs.nanolett.4c00129&partnerID=40&md5=2c44bd81e8363b9e4c2ee3585d172460
Access Level:acceso abierto
Palabra clave:free-electron laser
heat transfer
nanoscale all-optical switching
transient grating
ultrafast spin dynamics
Descripción
Sumario: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. © 2024 American Chemical Society

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