The coupling of electrons to spin excitations and the generation of magnons is essential for spin mixing in the ultrafast magnetization dynamics of 3d ferromagnets. Although magnon energies are generally much larger than phonon energies, until now their electronic band renormalization effect in 3d ferromagnets suggests a significantly weaker quasiparticle interaction. Using spin- and angle-resolved photoemission, we show an extraordinarily strong renormalization leading to two-branch splitting of an iron surface resonance at ∼200 meV. Its strong magnetic linear dichroism unveils the magnetic nature and momentum dependence of the energy renormalization. By determining the frequency- and momentum-dependent self-energy due to generic electron–boson interaction to compute the resultant electron spectral function, we suggest that the surface-state splitting can be described by strong coupling to an optical spin wave in an iron thin film.
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16 May 2022
Research Article|
May 17 2022
Strong momentum-dependent electron–magnon renormalization of a surface resonance on iron
Special Collection:
Ultrafast and Terahertz Spintronics
Beatrice Andres;
Beatrice Andres
1
Fachbereich Physik, Freie Universität Berlin
, Arnimallee 14, 14195 Berlin, Germany
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Martin Weinelt
;
Martin Weinelt
a)
1
Fachbereich Physik, Freie Universität Berlin
, Arnimallee 14, 14195 Berlin, Germany
a)Author to whom correspondence should be addressed: [email protected]
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Hubert Ebert
;
Hubert Ebert
2
Ludwig-Maximilians-Universität München
, Butenandtstr. 5-13, 81377 München, Germany
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Jürgen Braun;
Jürgen Braun
2
Ludwig-Maximilians-Universität München
, Butenandtstr. 5-13, 81377 München, Germany
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Alex Aperis
;
Alex Aperis
3
Department of Physics and Astronomy, Uppsala University
, P. O. Box 516, 75120 Uppsala, Sweden
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Peter M. Oppeneer
Peter M. Oppeneer
3
Department of Physics and Astronomy, Uppsala University
, P. O. Box 516, 75120 Uppsala, Sweden
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the APL Special Collection on Ultrafast and Terahertz Spintronics.
Appl. Phys. Lett. 120, 202404 (2022)
Article history
Received:
February 28 2022
Accepted:
May 03 2022
Citation
Beatrice Andres, Martin Weinelt, Hubert Ebert, Jürgen Braun, Alex Aperis, Peter M. Oppeneer; Strong momentum-dependent electron–magnon renormalization of a surface resonance on iron. Appl. Phys. Lett. 16 May 2022; 120 (20): 202404. https://doi.org/10.1063/5.0089688
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