All-optical probe of coherent spin waves

M. Kampen, van, C. Józsa, J.T. Kohlhepp, P.R. LeClair, L. Lagae, W.J.M. Jonge, de, B. Koopmans

Research output: Contribution to journalArticleAcademicpeer-review

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A novel, all-optical method to excite and detect spin waves in magnetic materials is presented. By exploiting the temperature dependence of the magnetic anisotropy, an ultrashort laser pulse is efficiently converted in a picosecond "anisotropy field" pulse that triggers a coherent precession of the magnetization. Recording the temporal evolution of the precessing spins by a time-delayed probe-pulse provides a quantitative method to study locally the magnetic anisotropy, as well as switching and damping phenomena in micromagnetic structures. Applications to nickel and permalloy ( Ni80Fe20) films are discussed, particularly showing the possibility to explore standing spin waves in thin films.
Original languageEnglish
Article number227201
Pages (from-to)227201-1/4
Number of pages4
JournalPhysical Review Letters
Issue number22
Publication statusPublished - 2002


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