Coherent optical phonons and parametrically coupled magnons induced by femtosecond laser excitation of the Gd(0001) surface |
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Authors: | Melnikov A Radu I Bovensiepen U Krupin O Starke K Matthias E Wolf M |
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Affiliation: | Freie Universit?t Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin-Dahlem, Germany. |
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Abstract: | Coherent spin dynamics in the THz domain coupled to a coherent phonon is observed in the time-resolved second harmonic response of the Gd(0001) ferromagnetic metal surface. An LO phonon of 2.9 THz is excited by a transient charge displacement at the surface caused by resonant absorption of a fs laser pulse in the exchange-split surface state. This lattice vibration modulates the interlayer distance inducing a coherent variation of the exchange interaction between spins in adjacent layers. The resulting magnetization dynamics is considered as optical magnon wave packets coupled to the phonon. |
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