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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-Kühn^1,2, Daniel Schick¹, Niko Pontius¹, Christoph Trabant^1,2,3, Rolf Mitzner¹, Karsten Holldack¹, Hartmut Zabel⁴, Alexander Föhlisch^1,2, 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.