Allgemeines Physikalisches Kolloquium - WS 2013/14

Ort:	48149 Münster, Wilhelm-Klemm-Straße 10, IG 1, HS 2
Zeit:	Donnerstag, 09.01.2014, 16 Uhr c.t.
	Kolloquiums-Kaffe: ab 15:45 Uhr vor dem Hörsaal

Probing the magnetic nature of a single atom

Dr. Alexander A. Khajetoorians, Institut für Angewandte Physik, Universität Hamburg

With the development of scanning tunneling microscopy at ultra-low temperatures and in magnetic fields, two complementary methods, namely spin-polarized scanning tunneling spectroscopy (SP-STS) and inelastic STS (ISTS), can address single spins at the atomic scale. While SP-STS reads out the projection of the impurity magnetization, ISTS detects the excitations of this magnetization as a function of an external magnetic field. They are thus the analogs of magnetometry and spin resonance measurements pushed to the single atom limit. We have recently demonstrated that it is possible to reliably combine single atom magnetometry with an atom-by-atom bottom-up fabrication to realize complex atomic-scale magnets with tailored properties. In this talk, I will address recent developments in probing the spin excitations and magnetization curves of single and coupled atoms on a multitude of non-magnetic surfaces, and the effects of the electronic structure on the precessional dynamics of the atomic spin. Moreover, I will discuss investigations of the magnetization dynamics of coupled spins as probed with spin-resolved STM techniques and how the relaxation is affected by processes like quantum tunneling and spin-transfer torque.

Einladender: Dr. Wegner

Im Auftrag der Hochschullehrer des Fachbereichs Physik

Prof. Dr. N.A. Stolwijk