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PGI-1 Seminar: Dr. Sebastian Loth

Spin dynamics of few-atom nanomagnets

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27 Jan 2016 11:30
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PGI Lecture Hall

MPI Hamburg

Abstract:

Spintronics strive to harness nanoscale magnetism for information technology and sensing applications. Inherent to this dream is the requirement to couple small nanoscopic magnets to the macro-world via electric leads. Recent advances in scanning tunneling microscopy make it possible to study the interaction between metallic surfaces and magnets even at the extreme scale of individual atoms.
We use low-temperature scanning tunneling microscopy to create small magnetic nanostructures of our own design atom by atom. In this way we can build ferromagnetic or antiferromagnetic nanostructures that show two stable magnetic states or structures that have a non-magnetic ground state but feature rich magnetic structure in its excited states. A combination of spin-polarized imaging and fast electronic spectroscopy at GHz speed allows us to measure the nanosecond-fast magnetization dynamics of these nanostructures. I will introduce how exchange interaction between atoms can be used to control their spin ground state and excitation dynamics and show that this effect can be harnessed for non-local measurements of the spin.

Contact

Prof. Dr. Stefan Blügel
Phone: +49 2461 61-4249
Fax: +49 2461 61-2850
email: s.bluegel@fz-juelich.de