Coherent Optical Phonons and Parametrically Coupled Magnons Induced by 
Femtosecond Laser Excitation of the Gd(0001) Surface

Melnikov, A.; Radu, I.; Bovensiepen, U.; Krupin, O.; Starke, K.; Matthias, E.; Wolf, Martin

doi:10.1103/PhysRevLett.91.227403

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Coherent Optical Phonons and Parametrically Coupled Magnons Induced by Femtosecond Laser Excitation of the Gd(0001) Surface

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Melnikov, A., Radu, I., Bovensiepen, U., Krupin, O., Starke, K., Matthias, E., et al. (2003). Coherent Optical Phonons and Parametrically Coupled Magnons Induced by Femtosecond Laser Excitation of the Gd(0001) Surface. Physical Review Letters, 91(22): 227403. doi:10.1103/PhysRevLett.91.227403.

Cite as: https://hdl.handle.net/21.11116/0000-000E-28CA-2

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.