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 2̄ axis from the excited states with spins along the 111 or 1 1̄ 0 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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Nov 23 2010|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics