Veranstaltungsdetails

20.1.2015, 17:00
Jungiusstr. 11, Hörsaal AP

SFB 668 - Kolloquium

Dr. D. Sander (MPI, Halle):

New insights into nanomagnetism and superconductivity by low-temperature scanning tunneling microscopy

Spin-polarized scanning tunneling microscopy at low temperature (8 K) and in high magnetic fields (6 T) is a powerful technique to investigate magnetic properties of individual nanoscale objects ranging in size form single atoms to several thousand atoms [1]. I focus on the magnetization reversal [2] and the spin-dependent electronic properties of Co [3] and Fe-decorated Co islands [4] with some thousand atoms. The high spatial resolution of the scanning tunneling spectroscopy reveals the significance of structural and electronic relaxation [5] for the magnetic anisotropy and the spin-dependent transport properties [6] of single islands. In an outlook I present first results on superconductivity of Pb monolayers and islands from our new STM, which operates at 0.3 K in a vector magnetic field. Future work will focus on investigations of the interplay between superconductivity and magnetism on the nanoscale. [1] H. Oka, O. Brovko, M. Corbetta, V. Stepanyuk, D. Sander, J. Kirschner, Rev. Mod. Phys. *86* (2014), 1127. [2] S. Ouazi, G. Rodary, S. Wedekind, H. Oka, D. Sander, J. Kirschner, Phys. Rev. Lett. *108 *(2012) 107206. [3] H. Oka, P. Ignatiev, S. Wedekind, G. Rodary, L. Niebergall, V. Stepanyuk, D. Sander, J. Kirschner, Science *327* (2010) 843. [4] S. Phark, J. Fischer, M. Corbetta, D. Sander, K. Nakamura, J. Kirschner, Nat. Commun.*5*:5183 doi: 10.1038/ncomms6183 (2014).// [5] O. Brovko, D. Bazhanov, H. Meyerheim, D. Sander, V. Stepanyuk, J. Kirschner, Surface Science Reports*69* (2014) 159. [6] H. Oka, K. Tao, S. Wedekind, G. Rodary, V. Stepanyuk, D. Sander, J. Kirschner, Phys. Rev. Lett. *107* (2011) 187201.