期刊
PHYSICAL REVIEW B
卷 82, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.174431
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资金
- de Nederlandse Organizatie voor Wetenschappelijk Onderzoek (NWO)
- de Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Deutsche Forschungsgemeinschaft (DFG) [SPP1133]
- Foundation for the Promotion of Industrial Science
Femtosecond laser excitation of antiferromagnetic NiO leads to an oscillatory temporal behavior of optical second-harmonic generation in this material. Depending on laser pulse length, these oscillations have frequencies of either 55 or 1 GHz, which correspond to the magnetic anisotropy energy separating the ground state with spins along the < 11 (2) over bar > axis from the excited states with spins along the < 111 > or < 1 (1) over bar0 > axis, respectively. The oscillations can be explained as beatings between the ground and the respective excited state triggered by an instantaneous laser-induced flip of the Ni2+ spins which can thus be controlled three dimensionally by pulse shaping.
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