Ultrafast magneto-optics in nickel : magnetism or optics?

B. Koopmans, M. Kampen, van, J.T. Kohlhepp, W.J.M. Jonge, de

Research output: Contribution to journalArticleAcademicpeer-review

413 Citations (Scopus)
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Abstract

Several magnetic and optical processes contribute to the magneto-optical response of nickel thin films after excitation by a femtosecond laser pulse. We achieved a first complete identification by explicitly measuring the time-resolved Kerr ellipticity and rotation, as well as its temperature and magnetic field dependence in epitaxially grown (111) and (001) oriented Cu/Ni/Cu wedges. The first hundreds of femtoseconds the response is dominated by state filling effects. The true demagnetization takes approximately 0.5–1 ps. At the longer (sub-ns) time scales the spins are found to precess in their anisotropy field. Simple and transparent models are introduced to substantiate our interpretation.
Original languageEnglish
Pages (from-to)844-847
Number of pages4
JournalPhysical Review Letters
Volume85
Issue number4
DOIs
Publication statusPublished - 2000

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