TY  - JOUR
A1  - Deb, Marwan
A1  - Popova, Elena
A1  - Hehn, Michel
A1  - Keller, Niels
A1  - Petit-Watelot, Sebastien
A1  - Bargheer, Matias
A1  - Mangin, Stephane
A1  - Malinowski, Gregory
T1  - Femtosecond Laser-Excitation-Driven High Frequency Standing Spin Waves in Nanoscale Dielectric Thin Films of Iron Garnets
T2  - Physical review letters
N2  - We demonstrate that femtosecond laser pulses allow triggering high-frequency standing spin-wave modes in nanoscale thin films of a bismuth-substituted yttrium iron garnet. By varying the strength of the external magnetic field, we prove that two distinct branches of the dispersion relation are excited for all the modes. This is reflected in particular at a very weak magnetic field (similar to 33 mT) by a spin dynamics with a frequency up to 15 GHz, which is 15 times higher than the one associated with the ferromagnetic resonance mode. We argue that this phenomenon is triggered by ultrafast changes of the magnetic anisotropy via laser excitation of incoherent and coherent phonons. These findings open exciting prospects for ultrafast photo magnonics.
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/48816
SN  - 0031-9007
SN  - 1079-7114
VL  - 123
IS  - 2
PB  - American Physical Society
CY  - College Park
ER  -