Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: Electronic Structure: Surface Magnetism and Spin Phenomena

O 48.10: Poster

Dienstag, 8. März 2016, 18:15–20:30, Poster E

Non-collinear spin-states in dilute 1D chains induced by Dzyaloshinskii-Moriya interaction — •Manuel Steinbrecher¹, Alexander Ako Khajetoorians^1,2, Jens Wiebe¹, and Roland Wiesendanger¹ — ¹INF, Hamburg University, 20355 Hamburg, Germany — ²IMM, Radboud University, 6525 AJ Nijmegen, The Netherlands

Nanostructures of coupled atomic spins are of high interest for future spintronic applications. Therefore, a deep understanding of the behavior of single magnetic atoms deposited on metallic surfaces and of the coupling between several of these spins is mandatory. By using the tip of a scanning tunneling microscope as a tool, single atoms can be moved on a surface [1] to build artificial nanostructures. Realizing bottom-up fabricated 1D spin chains so far led to simple ferromagnetic [2] or antiferromagnetic [3] ground states described by Néel states [4,5].
When using a heavy spin-orbit coupling material, like a Pt(111) surface [6], as a substrate we showed that we can tune the strength of an anisotropic, indirect exchange interaction between indidivual Fe atoms, namely the Dzyaloshinskii-Moriya interaction [7]. With this knowledge we were able to build 1D spin chains and induce non-collinear spin states in the chains, resulting in exotic magnetic behavior. [1] Eigler and Schweizer, Nature 344, 524 (1990); [2] Gambardella et al., Nature 416, 301 (2002); [3] Hirjibehedin et al., Science 312, 1021 (2006); [4] Khajetoorians et al., Science 332, 1062 (2011); [5] Khajetoorians et al., Nat. Phys. 8, 497 (2012); [6] Khajetoorians et al., PRL 111, 157204 (2013); [7] Khajetoorians et al., Nat. Commun., submitted (2015)