Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

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

Tuesday, March 28, 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.