Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation - Université de Lorraine Access content directly
Journal Articles Applied Physics Letters Year : 2020

Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation

Abstract

We have measured the hot-electron-induced demagnetization of a [Co/Pt] 2 multilayer in M(x nm)/Cu(100 nm)/[Co(0.6 nm)/Pt(1.1 nm)] 2 samples depending on the nature of the capping layer M and its thickness x. We found out that a Pt layer is more efficient than [Co/Pt] X , Cu, or MgO layers in converting infrared (IR) photon pulses into hot-electron pulses at a given laser power. We also found out that the maximum relative demagnetization amplitude is achieved for M(x) ¼ Pt (7 nm). Our experimental results show qualitative agreement with numerical simulations based on the superdiffusive spin transport model. We concluded that the maximum relative demagnetization amplitude, which corresponds to the highest photon conversion into hot electrons, is an interplay between the IR penetration depth and the hot-electron inelastic mean free path within the capping layer.
Fichier principal
Vignette du fichier
20 APL Bergeard - Hal docx.pdf (1.51 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03039843 , version 1 (04-12-2020)

Identifiers

Cite

N Bergeard, M Hehn, K Carva, P Baláž, S Mangin, et al.. Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation. Applied Physics Letters, 2020, 117, ⟨10.1063/5.0018502⟩. ⟨hal-03039843⟩
120 View
75 Download

Altmetric

Share

Gmail Facebook X LinkedIn More