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MA: Fachverband Magnetismus

MA 12: Focus Session: Terahertz Spintronics

MA 12.2: Topical Talk

Tuesday, March 12, 2013, 10:00–10:30, H10

New frontiers of ultrafast spin manipulation: femtosecond spin superdiffusion — •Marco Battiato — Uppsala University, Uppsala, Sweden

The origin of the ultrafast demagnetization has been a mystery for long time. Recently an approach based on spin dependent electron diffusion has been proposed. In the theoretical work the spin dependent electron transport in the femtosecond timescale had been accurately modeled and predicted as responsible for the ultrafast demagnetization.

It has been shown that 1) the femtosecond transport is within the more general regime of superdiffusion; 2) spin bunches with velocities higher than the Fermi velocity can be launched from a ferromagnetic material and 3) can be used to strongly manipulate the magnetization of distant layers. The newest experimental findings are proving the model by showing uncontrovertibly the sign of spin transport and validating the model*s unexpected predictions (see other talks within the symposium on THz spinelectronics).

The impact of these new discoveries goes beyond the field of ultrafast demagnetization. It shows how spin information can be, not only manipulated but most importantly transferred at unprecedented speeds. This new discovery lays the basis for femtosecond spintronics.