Laser-induced terahertz spin transport in magnetic nanostructures arises from the same force as ultrafast demagnetization
Reza Rouzegar, Liane Brandt, Lukáš Nádvorník, David A. Reiss, Alexander L. Chekhov, Oliver Gueckstock, Chihun In, Martin Wolf, Tom S. Seifert, Piet W. Brouwer, Georg Woltersdorf, Tobias Kampfrath
Abstract
The authors observe here that (a) laser-induced ultrafast demagnetization (UDM) of a metallic ferromagnet $F$ has the same time evolution as (b) terahertz spin transport (TST) from $F$ into an adjacent normal metal $N$. They conclude that UDM in $F$ and TST in $F$|$N$ samples are driven by the same force: (c) a generalized spin voltage, i.e., an excess magnetization of $F$. One can now apply the vast knowledge of UDM to TST to significantly increase spin-current amplitudes for ultrafast spintronic applications.
Topics & Concepts
Ultrashort pulseTerahertz radiationSpintronicsDemagnetizing fieldMagnetization dynamicsSpin (aerodynamics)LaserFerromagnetismMagnetizationCondensed matter physicsPhysicsOptoelectronicsOpticsMagnetic fieldQuantum mechanicsThermodynamicsMagnetic properties of thin filmsQuantum and electron transport phenomenaMolecular Junctions and Nanostructures