Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.164: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Ultrafast spin and lattice dynamics in antiferromagnetic Cr2O3 — •Bas B. van Aken, Takuya Satoh, Nguyen P. Duong, and Manfred Fiebig — Max-Born-Institut, Max-Born-Straße 2a, 12489 Berlin
The magnetisation and lattice dynamics of antiferromagnetic Cr2O3 was investigated with optical second harmonic generation. Intense 100 fs laser pulses excited the sample and probed the magnetic and crystallographic sublattices. Using the polarisation degrees of freedom, the amplitude of the magnetic and crystallographic order parameter and the phase between them can be resolved. Demagnetisation processes on three different time scales from ≪ 1 ps to ∼ 7 ps were distinguished. The different nature of the three demagnetisation channels is predominantly seen in the phase, which is determined by time-resolved interference experiments. The magnetisation dynamics exhibits distinct differences to that of ferromagnetic compounds.