Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 74: Surface and Interface Magnetism II (O jointly with MA)

O 74.4: Talk

Thursday, April 3, 2014, 11:15–11:30, WIL C107

Spin Excitations in STM Evaluated in Perturbation Theory — •Markus Ternes — Max-Planck Institut für Festkörperphysik, Heisenbergstr. 1, 70569 Stuttgart, Germany

Inelastic spin flip spectroscopy has been very successful to characterize and manipulate the properties of single spins as well as coupled spin structures on surfaces. I will show that a perturbative approach of the interactions between the localized spin system, the probing tip, and the supporting substrate can results in fits to experimental data with unprecedented accuracy. The employed model is based on a transport Hamiltonian which accounts for spin-flip and Coulomb scattering of the tunneling electrons with the magnetic impurity system. Higher order and correlations effects are considered by including spin-spin scattering between the impurity and substrate electrons and by solving the corresponding rate-equations up to 3rd order. Despite its simplicity, the model enables a deeper understanding of the relevant couplings in such systems and provides an easy access to the dynamical properties and correlations in atomic scale spin systems.