Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Poster Session III (Methods: Atomic and electronic structure; Methods: electronic structure theory; Methods: Molecular simulations and statistical mechanics; Methods: Sanning probe techniques; Methods: other (experimental); Methods: other (theory) )

O 60.14: Poster

Wednesday, March 24, 2010, 17:45–20:30, Poster B2

Observation of Spin Excitation by Inelastic Tunneling Spectroscopy of Fe atoms on a Semiconductor Surface — •Alexander A. Khajetoorians, Bruno Chilian, Sergei Schuwalow, Frank Lechermann, Jens Wiebe, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Hamburg, Germany

We present a combined experimental and theoretical study of single Fe atoms on a III-V (110) semiconductor surface. Using tunneling spectroscopy at very low temperature (300mK), we observe a zero-field gap in the differential conductivity measured on the Fe atom which can be attributed to magnetic anisotropy. The total spin of the Fe atom as well as its anisotropy is also calculated by first principles calculations within density functional theory and related to the experimental data utilizing a simple quantum magnetic Hamiltonian. In the context of this model, we discuss the predicted magnetic field dependent magnetization and relate it to experimental data in high magnetic fields (12T).