Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Spin Structures at Surfaces and in thin films II

MA 53.9: Vortrag

Freitag, 4. April 2014, 11:30–11:45, BEY 118

Interplay of orbital-dependent tunneling and spin-polarization in STM/STS — Gábor Mándi, Mátyás Seress, and •Krisztián Palotás — Budapest University of Technology and Economics, Department of Theoretical Physics, Budafoki út 8., H-1111 Budapest, Hungary

Scanning tunneling microscopy (STM) images of magnetic surfaces can show contrast changes depending on the bias voltage or tip magnetization orientation [1]. We investigate the interplay of orbital-dependent tunneling [2] and spin-polarization effects on constant-current STM images of the Fe(110) surface. We find that the atomic contrast inversion is sensitive to the spin-polarization and the orbital character of the STM tip [3]. Taking a moiré-patterned Co/Ag(111) surface [4], we calculate differential conductance tunneling spectra (STS), and the results demonstrate the sensitivity of the spectra on the spin-polarization and the orbital composition of the tip.

The simulations are performed using a three-dimensional Wentzel-Kramers-Brillouin tunneling model based on ab initio electronic structure data [5].

References:

[1] K. Palotás, Phys. Rev. B 87, 024417 (2013).

[2] K. Palotás et al., Phys. Rev. B 86, 235415 (2012).

[3] G. Mándi and K. Palotás, arXiv:1309.4696 (2013).

[4] T. G. Gopakumar et al., Chem. Phys. Lett. 484, 59 (2009).

[5] K. Palotás et al., Front. Phys., DOI: 10.1007/s11467-013-0354-4 (2013).