Ultrafast magneto-optics in nickel : magnetism or optics?

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

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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Samenvatting

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.
Originele taal-2Engels
Pagina's (van-tot)844-847
Aantal pagina's4
TijdschriftPhysical Review Letters
Volume85
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 2000

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