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) = 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.
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Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation
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30 November 2020
Research Article|
December 03 2020
Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation
N. Bergeard
;
N. Bergeard
a)
1
Institut Jean Lamour, CNRS-Université de Lorraine
, 54011 Nancy, France
2
Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504
, F-67000 Strasbourg, France
a)Author to whom correspondence should be addressed: [email protected]
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M. Hehn
;
M. Hehn
1
Institut Jean Lamour, CNRS-Université de Lorraine
, 54011 Nancy, France
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K. Carva
;
K. Carva
3
Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University
, Ke Karlovu 5, CZ-121 16 Prague, Czechia
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P. Baláž
;
P. Baláž
3
Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University
, Ke Karlovu 5, CZ-121 16 Prague, Czechia
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S. Mangin
;
S. Mangin
1
Institut Jean Lamour, CNRS-Université de Lorraine
, 54011 Nancy, France
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G. Malinowski
G. Malinowski
1
Institut Jean Lamour, CNRS-Université de Lorraine
, 54011 Nancy, France
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 117, 222408 (2020)
Article history
Received:
June 16 2020
Accepted:
October 14 2020
Citation
N. Bergeard, M. Hehn, K. Carva, P. Baláž, S. Mangin, G. Malinowski; Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation. Appl. Phys. Lett. 30 November 2020; 117 (22): 222408. https://doi.org/10.1063/5.0018502
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