Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 7: Symposium Recent Progress in Scanning Probe Methods

O 7.2: Fachvortrag

Freitag, 4. März 2005, 11:30–12:00, TU H3005

Spin Mapping on the Atomic Scale: From 2D Antiferromagnets to Single Impurities — •Roland Wiesendanger — University of Hamburg, Institute of Applied Physics, Jungiusstr. 11, 20355 Hamburg

Spin-polarized Scanning Tunneling Microscopy (SP-STM)[1] and Spectroscopy (SP-STS)[2] have allowed the visualization of atomic-scale spin structures [3,4] and the investigation of the spin-dependent local density of states spatially resolved [5]. In a recent SP-STM experiment we could prove that a single monolayer of Fe on a W(001) substrate exhibits a c(2x2) antiferromagnetic ground state with perpendicular anisotropy in contrast to a single Fe monolayer on W(110) which is ferromagnetic with in-plane anisotropy [6]. Spin-dependent scattering at single oxygen impurities on Fe/W(110) was visualized in real-space reflecting the orbital nature of the electronic states involved as well as their spin character [7]. Finally, applications of SP-STM and SP-STS for studying spin states of single magnetic impurities will be discussed. [1]R. Wiesendanger et al., Phys. Rev. Lett. 65, 247 (1990). [2]M. Bode, M. Getzlaff, R. Wiesendanger, Phys. Rev. Lett. 81, 4256 (1998). [3]R. Wiesendanger et al., Science 255, 583 (1992). [4]S. Heinze et al., Science 288, 1805 (2000). [5]O. Pietzsch et al., Phys. Rev. Lett. 92, 057202 (2004). [6]O. Pietzsch et al., Phys. Rev. Lett. 84, 5212 (2000). [7]K. von Bergmann et al., Phys. Rev. Lett. 92, 046801 (2004).