Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: Surface Magnetism 2 (Joint Session with O)
MA 49.4: Vortrag
Donnerstag, 23. März 2017, 10:15–10:30, HSZ 401
towards non-perturbative reading of atomic spin states with STM — •luigi malavolti1,2, steffen rolf-pissarczyk1,2, shichao yan1,2, jacob burgess1,2, gregory mcmurtrie1,2, and sebastian loth1,2,3 — 1Max-Planck-Institut für Struktur und Dynamik der Materie, Hamburg, Deutschland — 2Max-Planck-Institut für Festkörperforschung, Stuttgart, Deutschland — 3Institut für Funktionelle Materie und Quantentechnologien, Universität Stuttgart, Deutschland
Scanning tunneling microscopy (STM) has proven to be an essential tool for the investigation of magnetic phenomena at the atomic scale [1]. By using an STM it is possible to encode, and read information, in the spin state of nano-objects [2]. However, reading the spin state without erasing the information entails fundamental problems due to the quantum nature of the process [3]. This is related to the perturbations introduced by the STM reading: the proximity effect of the tip, the presence of electric field and the tunneling electrons-spin system interaction. Here, we use the high magnetic sensitivity of an atomic scale sensor to read the state of a nearby nano-antiferromagnet (nano-AF). The sensor detects small changes in the local magnetic environment induced by the presence of the nano-AF and transduces them into conductivity changes. This remote reading scheme removes the tip from the nano-AF and effectively mitigates the perturbation, allowing spin state read-out that is five times less invasive than direct inspection.
[1] R. Wiesendanger, Rev. Mod. Phys. 81, 1495 (2009). [2] S. Loth, et al., Science 335, 196 (2012). [3] J.-P. Gauyacq, et al., Phys. Rev. Lett. 110, 87201 (2013).