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Ultrafast magnetization dynamics: Microscopic electronic configurations and ultrafast spectroscopy
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0001-7788-6127
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2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 6, 064403Article in journal (Refereed) Published
Abstract [en]

We provide an approach for the identification of the electronic and magnetic configurations of ferromagnetic Fe after an ultrafast decrease or increase of the magnetization. The model is based on the well-grounded assumption that, after an ultrafast variation of the magnetization, the system achieves a partial thermal equilibrium. With statistical arguments we show that the magnetic configurations are qualitatively different in the case of reduced or increased magnetization. The predicted magnetic configurations are then used to compute the dielectric response at the 3p (M) absorption edge, which is directly related to the changes observed in the experimental T-MOKE data. The good qualitative agreement between theory and experiment offers a substantial support for the validity of the model, and to the very existence of an ultrafast increase of the magnetization.

Place, publisher, year, edition, pages
2015. Vol. 92, no 6, 064403
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-173146DOI: 10.1103/PhysRevB.92.064403ISI: 000358929600006Scopus ID: 2-s2.0-84939856513OAI: oai:DiVA.org:kth-173146DiVA: diva2:854874
Funder
Swedish Research CouncilThe Royal Swedish Academy of SciencesKnut and Alice Wallenberg FoundationEU, FP7, Seventh Framework Programme, 306447
Note

QC 20150918

Available from: 2015-09-18 Created: 2015-09-07 Last updated: 2017-12-04Bibliographically approved

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Delin, Anna

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