Ultrafast demagnetization in iron

Title

Ultrafast demagnetization in iron: Separating effects by their nonlinearity

 Author

Bühlmann, Kevin (ETH Zürich)
Gort, Rafael (ETH Zürich)
Salvatella, Gerard (ETH Zürich)
Däster, Simon (ETH Zürich)
Fognini, A.W. (TU Delft QN/Zwiller Lab; ETH Zürich)
Bähler, Thomas (ETH Zürich)
Dornes, Christian (ETH Zürich)
Vaz, C. A.F. (Paul Scherrer Institut)
Vaterlaus, Andreas (ETH Zürich)
Acremann, Yves (ETH Zürich)

Date

2018

 Abstract

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.


 To reference this document use:

http://resolver.tudelft.nl/uuid:fe0844dd-94f2-4ef5-bbcd-46c4229f51e9

 DOI

https://doi.org/10.1063/1.5040344

 Source

Structural Dynamics, 5 (4)

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2018 Kevin Bühlmann, Rafael Gort, Gerard Salvatella, Simon Däster, A.W. Fognini, Thomas Bähler, Christian Dornes, C. A.F. Vaz, Andreas Vaterlaus, Yves Acremann
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