Ultrafast demagnetization in iron: Separating effects by their nonlinearity.
- Bühlmann K Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Gort R Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Salvatella G Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Däster S Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Fognini A Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Bähler T Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
- Dornes C Swiss Light Source, Paul Scherrer Institut, PSI, 5232 Villigen, Switzerland.
- Vaz CAF Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Vaterlaus A Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
- Acremann Y
- 2018-09-04
Published in:
- Structural dynamics (Melville, N.Y.). - 2018
English
The laser-driven ultrafast demagnetization effect is one of the long-standing problems in solid-state physics. The time scale is given not only by the transfer of energy, but also by the transport of angular momentum away from the spin system. Through a double-pulse experiment resembling two-dimensional spectroscopy, we separate the different pathways by their nonlinear properties. We find (a) that the loss of magnetization within 400 fs is not affected by the previous excitations (linear process), and (b) we observe a picosecond demagnetization contribution that is strongly affected by the previous excitations. Our experimental approach is useful not only for studying femtosecond spin dynamics, but can also be adapted to other problems in solid-state dynamics.
- Language
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- English
- Open access status
- gold
- Identifiers
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- DOI 10.1063/1.5040344
- PMID 30175157
- Persistent URL
- https://sonar.ch/global/documents/15604
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