Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 16: Magnetic Excitations: from surfaces down to adatoms (jointly with MA)

O 16.4: Topical Talk

Montag, 11. März 2013, 16:30–17:00, H23

Magnetization dynamics derived from excitations of single magnetic atoms on surfaces — •Alexander Ako Khajetoorians — Hamburg University, Hamburg, 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 [4-5]. 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 the electronic structure on the precessional dynamics of the atomic spin. Moreover, I will discuss investigations of the magnetization dynamics [6] 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. [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, in press (2012)