Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Posters: Scanning Probe Methods

O 63.1: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P2

Toward a multiprobe- high frequency- spin-polarized scanning tunneling microscope — •Johannes Friedlein, Andreas Sonntag, Jonas Harm, Stefan Krause, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg

Controlling the dynamics of domain walls in nanowires by spin-polarized currents and magnetic fields is essential for the development of new spintronic devices [1,2]. Recently, the determination of spin-relaxation times in the nanosecond regime by means of pump-probe methods using a spin-polarized scanning tunneling microscope (SP-STM) has been reported [3].
We propose a multiprobe SP-STM that is optimized for picosecond time resolution in an external magnetic field and at temperatures below 2 K. This setup will enable us to investigate ultrafast spin transport dynamics in magnetic systems down to the atomic scale using pump-probe methods, e.g. measuring the domain wall propagation velocity along an atomic chain. Applying voltage pulses shorter than 100 ps to the tunnel junction requires a high bandwidth of at least 10 GHz and a short cabling length. This is in direct contrast to the low temperature concept of minimizing thermal flux input. We will present design considerations for simultaneously achieving the desired high frequency, low temperature and multiprobe properties.

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