Regensburg 2019 – wissenschaftliches Programm
MA 2.8: Vortrag
Montag, 1. April 2019, 11:30–11:45, H37
Ultrafast terahertz-driven spin switching in an antiferromagnet — •Stefan Schlauderer1, Christoph Lange1, Sebastian Baierl1, Thomas Ebnet1, Christoph P. Schmid1, Anatoly K. Zvezdin2,3, Alexey V. Kimel4,5, Rostislav V. Mikhaylovskiy5, and Rupert Huber1 — 1Department of Physics, University of Regensburg, 93053 Regensburg, Germany — 2Prokhorov General Physics Institute and P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russia — 3Moscow Institute of Physics and Technology (State University), Dolgoprudny 141700, Russia — 4Moscow Technological University (MIREA), Moscow 119454, Russia — 5Radboud University, Institute for Molecules and Materials, Nijmegen 6525 AJ, The Netherlands
Switching magnetization with maximal speed and minimal energy loss is essential for future information processing and data storage. Here, we use intense THz pulses with meV photon energies to switch electron spins between two states separated by a potential barrier, in the fastest and least dissipative way, and we reveal the corresponding temporal and spectral fingerprint. This goal is achieved by coupling the locally enhanced THz electric field of custom-tailored antennas with antiferromagnetic TmFeO3. Within their duration of 1 ps, single-cycle THz pulses abruptly change the magnetic anisotropy and trigger a large-amplitude ballistic spin motion. A characteristic phase flip, an asymmetric splitting of the magnon resonance, and a long-lived offset of the Faraday signal hallmark coherent spin switching into adjacent potential minima.