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SYAS: Symposium Attosecond and coherent spins: New frontiers
SYAS 1: Attosecond and Coherent Spins: New Frontiers
SYAS 1.4: Invited Talk
Thursday, September 30, 2021, 11:45–12:15, Audimax 2
All-coherent subcycle switching of spins by THz near fields — •Christoph Lange1, Stefan Schlauderer2, Sebastian Baierl2, Thomas Ebnet2, Christoph Schmid2, Darren Valovcin3, Anatoly Zvezdin4, Alexey Kimel5, Rostislav Mikhaylovskiy6, and Rupert Huber2 — 1Department of Physics, TU Dortmund University, 44227 Dortmund, Germany — 2Department of Physics, University of Regensburg, 93040 Regensburg, Germany — 3Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106, USA — 4P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russia. — 5Radboud University, Institute for Molecules and Materials, Nijmegen 6525 AJ, The Netherlands. — 6Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 1YW, UK.
As state-of-the-art electronics encounters ultimate limits, novel concepts for harnessing coherent charge and spin dynamics are being sought after. Here, we perform subcycle control of solid-state spins by exploiting a novel electric-dipole mediated mechanism to induce unprecedentedly large spin oscillations in the antiferromagnet TmFeO3. Strong, single-cycle THz pulses are enhanced by a custom metallic antenna fabricated on top of a bulk TmFeO3 sample, where the antenna's atomically strong near fields change the magnetic anisotropy on a subcycle scale. The resulting spin dynamics include a characteristic phase flip, an asymmetric splitting of the magnon resonance, and a long-lived offset of the polarization rotation, representing a novel fingerprint of all-coherent spin switching with minimal energy dissipation.