Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 62: Spintronics I (with MA/O/TT)

HL 62.3: Vortrag

Mittwoch, 2. April 2014, 10:45–11:00, POT 006

Time-resolved electrical detection of the inverse spin Hall Effect after ps optical excitation — •Manfred Ersfeld1, Ivan Stepanov1, Sammy Pissinger1, Christopher Franzen1, Sebastian Kuhlen1, Mihail Lepsa2, and Bernd Beschoten112nd Institute of Physics, RWTH Aachen University, Germany — 2Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich GmbH, Germany

Electrical detection of spin currents give an insight into the microscopic mechanisms of spin transport and play an important role in spin electronics. In previous experiments spin currents due to spin Hall effect have been imaged in optical measurements as spin accumulation.[1]

Here we report on the first time-resolved electrical detection of spin precession in n-InGaAs in time-resolved measurements of the inverse spin Hall effect. Net spin currents are achieved by applying electric fields and by polarization of the electrons with circularly polarized picosecond laser pulses. Electron spin precession in an external magnetic field can be monitored using a phase-triggered sampling oscilloscope as an oscillating voltage perpendicular to the applied electric field. Temperature dependent measurements of the spin Hall effect are presented. Time-resolved Faraday rotation measurements on the same sample under identical experimental conditions show good agreement between the measured spin dephasing times and the g-factor in the spin Hall measurements.
This Work has been supported by DFG through FOR 912

[1] Y. K. Kato et al., Science 306, 1910 (2004)

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