Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Surface Magnetism: Atoms and Molecules
O 4.7: Vortrag
Montag, 7. März 2016, 12:00–12:15, S052
Sensing Nanomagnets with an Atomically Assembled Quantum Spin Sensor — •Luigi Malavolti1,2, Shichao Yan1,2, Jacob Burgess1,2, Steffen Rolf-Pissarczyk1,2, and Sebastian Loth1,2 — 1Max-Planck Institut für Struktur und Dynamik der Materie, Hamburg, Deutschland — 2Max-Planck Institut für Festkörperforschung, Hamburg, Deutschland
Quantum spin systems can be used for sensing the magnetic environment with unprecedented accuracy and sensitivity [1]. Atom manipulation in the scanning tunnelling microscope allows construction of the quantum sensor in close proximity to the objects or region of interest.
Here, we show that a quantum spin sensor consisting of three Fe atoms on a monolayer copper nitride surface [2] can be used to probe the magnetic state of nearby nanomagnet. We built a nanomagnet that show no net spin and switches spontaneously between two Néel states. By characterizing the dynamic magnetic behaviour of the sensor using a dynamic pump-probe technique [2,3] we were able to detect the state of the nanomagnet at distance up to 3nm. We also demonstrate that, by an appropriate tuning of the properties of our sensor, the non-local sensing is possible even without a direct access to the relaxation time of the sensor. This opens the way to non-locally detect the magnetic state of other magnetic objects such as single molecule magnets and local atomic conditions on surfaces.
[1] Damadian, R. Science 171(3976), 1151-1153 (1971).
[2] Yan, S., et al., Nat Nano 10(1), 40-45 January (2015).
[3] Loth, S., et al., Science 329(5999), 1628-1630 (2010).