Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 51: Surface and Interface Magnetism I (O jointly with MA)
O 51.9: Talk
Wednesday, April 2, 2014, 12:30–12:45, WIL C107
Spin dynamics of a single magnetic adatom coupled to nano-mechanical oscillator operating on the atomic scale — •Michael Schüler1, Andrey Klavsyuk2, and Jamal Berakdar1 — 1Martin-Luther University Halle-Wittenberg, Institute for Physics, Karl-Heinrich-von-Fritsch-Straße 3, 06120 Halle, Germany — 2M. V. Lomonosov Moscow State University, Faculty of Physics, Vorob’evy gory, 119899 Moskow, Russia
Great advances have been achieved recently in fabricating, manipulating, and imaging in a controlled way the properties of small magnetic systems. One of the most versatile approaches is the scanning tunnelling microscopy (STM) or spectroscopy (STS) setup, allowing to access the dynamics of single magnetic adatoms on the surface. Within a simple model system, we demonstrate how the transport properties and the relaxation spin dynamics are related to the anisotropic environment. As a second step, we have computed the magnetic anisotropy parameters for the typical Fe@Cu(001) systems by ab initio methods which allows to compare the calculations including the STM tip with the result in absence of the tip. As it turns out, the presence of the tip has a considerable influence on the anisotropy energy. Therefore, depositing the tip apex on a nano-scaled cantilever yields a nanomechanical oscillator coupled to a single spin - a kind of hybrid systems that are subject of recent experimental investigations. We analyse the resulting spin dynamics and point out how the magnetic moment of the Fe atom can be controlled coherently.