Marco Battiato (SIMES Seminar)

Date(s) - Feb 12 2016
2:00 PM - 3:00 PM

Sycamore Room, Building 40, room 195


Ultrafast and gigantic spin injection in semiconductors

Marco Battiato

Institute of Solid State Physics, Vienna University of Technology

The injection of spin currents in semiconductors is one of the big challenges of spintronics. Motivated by the ultrafast demagnetisation and spin injection into metals, we propose an alternative femtosecond route based on the laser excitation of superdiffusive spin currents in a ferromagnet such as Ni. Our calculations show that the laser-induced creation of enormous transient electrical fields at a ferromagnet-semiconductor interface allows for a chargeless spin current with a record spin polarisations of 80%. Beyond that it is pulsed on the time scale of 100 femtoseconds which opens the door for new experiments and ultrafast spintronics.