The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals

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2020
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Frietsch, Björn
Carley, Robert
Teichmann, Martin
Bowlan, John
Döbrich, Kristian
Carva, Karel
Legut, Dominik
Weinelt, Martin
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Science Advances. American Association for the Advancement of Science (AAAS). 2020, 6(39), eabb1601. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.abb1601
Zusammenfassung

Ultrafast demagnetization of rare-earth metals is distinct from that of 3d ferromagnets, as rare-earth magnetism is dominated by localized 4f electrons that cannot be directly excited by an optical laser pulse. Their demagnetization must involve excitation of magnons, driven either through exchange coupling between the 5d6s-itinerant and 4f-localized electrons or by coupling of 4f spins to lattice excitations. Here, we disentangle the ultrafast dynamics of 5d6s and 4f magnetic moments in terbium metal by time-resolved photoemission spectroscopy. We show that the demagnetization time of the Tb 4f magnetic moments of 400 fs is set by 4f spin-lattice coupling. This is experimentally evidenced by a comparison to ferromagnetic gadolinium and supported by orbital-resolved spin dynamics simulations. Our findings establish coupling of the 4f spins to the lattice via the orbital momentum as an essential mechanism driving magnetization dynamics via ultrafast magnon generation in technically relevant materials with strong magnetic anisotropy.

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ISO 690FRIETSCH, Björn, Andreas DONGES, Robert CARLEY, Martin TEICHMANN, John BOWLAN, Kristian DÖBRICH, Karel CARVA, Dominik LEGUT, Ulrich NOWAK, Martin WEINELT, 2020. The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals. In: Science Advances. American Association for the Advancement of Science (AAAS). 2020, 6(39), eabb1601. eISSN 2375-2548. Available under: doi: 10.1126/sciadv.abb1601
BibTex
@article{Frietsch2020-09ultra-51167,
  year={2020},
  doi={10.1126/sciadv.abb1601},
  title={The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals},
  number={39},
  volume={6},
  journal={Science Advances},
  author={Frietsch, Björn and Donges, Andreas and Carley, Robert and Teichmann, Martin and Bowlan, John and Döbrich, Kristian and Carva, Karel and Legut, Dominik and Nowak, Ulrich and Weinelt, Martin},
  note={Article Number: eabb1601}
}
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