Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Magnetization and Demagnetization Dynamics III
MA 36.5: Vortrag
Mittwoch, 9. März 2016, 16:00–16:15, H34
Ultrafast and energy-efficient spin manipulation: Antiferromagnetism beats Ferromagnetism — •Nele Thielemann-Kühn1,2, Daniel Schick1, Niko Pontius1, Christoph Trabant1,2,3, Rolf Mitzner1, Karsten Holldack1, Hartmut Zabel4, Alexander Föhlisch1,2, and Christian Schüßler-Langeheine1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany — 2Institut für Physik und Astronomie, Universität Potsdam, Germany — 3II. Physikalisches Institut, Universität zu Köln, Germany — 4Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany
The wealth of studies in the field of ultrafast magnetic dynamics brought the understanding that the speed limit for spin manipulation comes from the achievable angular momentum transfer rate. In ferromagnets with net magnetization, any change of magnetic order requires transfer of angular momentum out of the spin system. Magnetic materials with non-parallel spins like antiferromagnets, offer the possibility to manipulate magnetic order by redistributing angular momentum within the spin system itself. We compare ferro (FM) - and antiferromagnetic (AFM) dynamics in one and the same material - metallic Dy - and find indeed clear differences. AFM spin order is faster manipulated by optical excitation than its FM counterpart. We assign the fast process in the AFM phase to an interatomic transfer of angular momentum within the spin system. Our findings point out a possible route towards ultrafast spin manipulation for magnetic devices.