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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 20.156: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Effect of disorder on diluted magnetic system — •Guixin Tang and Wolfgang Nolting — Institute of Physics, Humboldt University of Berlin, Newton street 15, D-12439 Berlin, Germany

We introduce a Heisenberg Hamiltonian for describing the magnetic properites of diluted magnetic semiconductors. The equation of motion for the magnon Green’s function is decoupled by Tyblikov approximation. The influence of disorder on the magnetic properties of diluted Heisenberg spin system is investigated using augment-space method in conjunction with the recursion technique. The resulting magnon spectral density is used to estimate the magnetizaion and Curie temperature of the three-dimension diluted magnetic system.