Workshop WS2: Spin-Dependent Phenomena for New Device Applications

s of Workshop Presentations Ultrafast and Gigantic Spin Injection in Semiconductor M. Battiato*, K. Held Institute of Solid State Physics, TU Wien, Vienna, 1040, Austria *[email protected] 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 even though only a fraction of the current crosses the Ni-Si interface, the spin current is still gigantic compared to typical semiconductor currents and other means of spin injection. It corresponds to a record spin polarisation of about 80%. Beyond that it is pulsed on the time scale of 100 femtoseconds which opens the door for new experiments and ultrafast spintronics. Theoretical Insights into Spintronic and Spin-Orbitronic Phenomena in Magnetic Tunnel Junctions and Interfaces