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MA: Fachverband Magnetismus

MA 26: Spin Dynamics / Spin -Torque II

MA 26.2: Vortrag

Donnerstag, 28. Februar 2008, 14:45–15:00, EB 301

Excitation of standing spin waves in antiferromagnetic thin films using hot electrons — •Chunlei Gao¹, Wulf Wulfhekel^1,2, Arthur Ernst¹, Guntram Fischer³, Wolfram Hergert³, Patrick Bruno¹, and Jürgen Kirschner¹ — ¹MPI für Mikrostrukturphysik, 06120 Halle — ²Physikalisches Institut, Universität Karlsruhe, 07131 Karlsruhe — ³Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, 06099 Halle

Standing spin waves confined in face centered tetragonal antiferromagnetic Mn thin films were locally excited by hot electron injection with a STM tip. The dispersion of the spin waves was obtained through measurements of the excitation energies in films of various thicknesses. The damping of the spin waves was extracted from the width of the excitation peaks. Both the experimental dispersion and the damping agree well with neutron scattering results of Ni doped γ-Mn. Further, ab-initio calculations of the spin wave dispersion confirm the experimental results.