Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Magnetic Adatoms on Surfaces (MA jointly with O)

O 34.1: Hauptvortrag

Dienstag, 1. April 2014, 15:00–15:30, BEY 118

Manipulating the magnetic properties of single atoms on surfaces — •Alexander Ako Khajetoorians — Institute of Applied Physics, Hamburg University, Hambury, Germany

With the development of sub-Kelvin high-magnetic field STM, two complementary methods, namely spin-polarized scanning tunneling spectroscopy (SP-STS) [1] and inelastic STS (ISTS) [2-3], 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 [4-6] on metallic surfaces [1,7]. In this talk, I will address recent developments in probing the spin excitations and magnetization curves of atoms on a multitude of non-magnetic surfaces, and the effects of hydrogenation on the magnetic state of such atoms. Finally, I will discuss investigations of the magnetization dynamics [6] of coupled spins as probed with spin-resolved STM. [1] A.A.K., et al. , PRL, 106, 037205 (2011); [2] A. J. Heinrich, et al. , Science, 306, 466 (2004); [3] A.A.K, et al. ,Nature, 467, 1084 (2010); [4] A.A.K., et al., Nature Physics, 8, 497 (2012) [5] A.A.K., et al. , Science, 332, 1062 (2011), [6] A.A.K., et al.,Science, 339, 55 (2013), [7] A.A.K., et al, PRL, 111, 126804 (2013).