Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Magnetic Surface Excitations

O 13.1: Hauptvortrag

Montag, 7. März 2016, 15:00–15:30, S052

Excitations and dynamics of non-collinear magnetization states in tailored adatom arrays — •Jens Wiebe — Department of Physics, Universität Hamburg, D-20355 Hamburg, Germany

Arrays of magnetic atoms adsorbed on the surface of a non-magnetic metal can be tailored in topology [1], magnetic anisotropy [2,3], interactions [1,4], and Kondo coupling [3] by combining different substrate/adatom species with the manipulation- [1], spin-resolved- [5] and inelastic- [6] spectroscopy capabilities of the scanning tunneling microscope. Such arrays are perfect model systems to study the complex phase diagram of strongly correlated multi-orbital electron systems. Here, I will focus on the rich physics we recently discovered in arrays of iron adatoms on platinum(111) [2,3,7]. This system can be theoretically described within the Hund’s metal framework. We can tune the individual constituents, the Hund’s impurities, from a regime of emergent magnetism to a multi-orbital Kondo state [3]. By coupling a few Hund’s impurities to arrays, we find non-collinear ground states induced by the substrate mediated Ruderman-Kittel-Kasuya-Yosida interaction [7]. I will present our investigation of the excitations and dynamics of such non-collinear magnetization states.

[1] A. A. Khajetoorians et al., Nat. Phys. 8, 497 (2012). [2] A. A. Khajetoorians et al., PRL 111, 157204 (2013). [3] A. A. Khajetoorians et al., Nat. Nano. 10, 958 (2015). [4] L. Zhou et al., Nat. Phys. 6 187 (2010). [5] J. Wiebe et al., JPD 44, 464009 (2011). [6] A. A. Khajetoorians et al., Nature 467, 1084 (2010). [7] A. A. Khajetoorians et al., Nat. Comm., (accepted, 2015).