Temperature dependent inverse spin Hall effect in Co/Pt spintronic emitters
M. Matthiesen (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
D. Afanasiev (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
J. R. Hortensius (TU Delft - QN/Caviglia Lab, Kavli institute of nanoscience Delft)
T. C. Van Thiel (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
R. Medapalli (National Institute of Technology, Andhra Pradesh , University of California)
E. E. Fullerton (University of California)
A. D. Caviglia (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
In bilayers of ferromagnets and heavy metals, which form the so-called spintronic emitters, the phenomena of ultrafast demagnetization and the inverse spin Hall effect (ISHE) conspire to yield remarkably efficient emission of electric pulses in the THz band. Light-induced demagnetization of the ferromagnet launches a pulse of spin current into the heavy metal, wherein it bifurcates into a radiative charge transient due to the ISHE. The influence of temperature on this combined effect should depend on both the magnetic phase diagram and the microscopic origin of spin Hall conductivity, but its exact dependence remains to be clarified. Here, we experimentally study the temperature dependence of an archetypal spintronic emitter, the Co/Pt bilayer, using electro-optic sampling of the emitted THz pulses in the time domain. The emission amplitude is attenuated with decreasing temperature, consistent with an inverse spin Hall effect in platinum of predominantly intrinsic origin.