Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2
O 71.7: Topical Talk
Thursday, September 8, 2022, 16:45–17:15, S051
Stochastic resonance as a new tool to investigate spin dynamics — •Susanne Baumann1, Nicolaj Betz1, Max Hänze1, Gregory McMurtrie1, Susan Coppersmith2, and Sebastian Loth1 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2School of Physics, University of New South Wales, Sydney, Australia
Stochastic resonance is an unusual phenomenon in which noise can be used as a resource to synchronize stochastic dynamics to a control signal [1,2]. In this talk, I will show how stochastic resonance can be induced in the spin switching of magnetic nanostructures on surfaces [3], and, more importantly, how we can use this as a tool to investigate the magnetization dynamics of these spin systems.
With this tool, one can get insight into the interaction of these structures with their environment. This also enables the observation of ultrafast dynamics of excited spin states that are not easily accessible to other scanning probe techniques. The new frequency resolved spectroscopy method allows for the broadband observation of spin dynamics with previously inaccessible bandwidth ranging from milliseconds to picoseconds.
References: [1] R. Benzi, J. Phys. A: Math. Gen 14, L453 (1981). [2] R. Löfstedt, S. N. Coppersmith, Phys Rev. Lett. 72, 1947 (1994). [3] M. Hänze*, G. McMurtrie* et al. Science Adv. 7 eabg2616 (2021).