Ultrafast terahertz spin dynamics: from phonon-induced spin order to coherent magnon control

K. W. Kim; M. Porer; C. Bernhard; J. Demsar; A. Pashkin; T. Kampfrath; A. Sell; M. Wolf; A. Leitenstorfer; R. Huber

doi:10.1117/12.2001236

21 February 2013 Ultrafast terahertz spin dynamics: from phonon-induced spin order to coherent magnon control

K. W. Kim, M. Porer, C. Bernhard, J. Demsar, A. Pashkin, T. Kampfrath, A. Sell, M. Wolf, A. Leitenstorfer, R. Huber

Proceedings Volume 8623, Ultrafast Phenomena and Nanophotonics XVII; 862307 (2013) https://doi.org/10.1117/12.2001236
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

Ultrashort pulses in the terahertz (THz) spectral range allow us to study and control spin dynamics on time scales faster than a single oscillation cycle of light. In a first set of experiments, we harness an optically triggered coherent lattice vibration to induce a transient spin-density wave in BaFe₂As₂, the parent compound of pnictide superconductors. The time-dependent multi-THz response of the non-equilibrium phases shows that the ordering quasi-adiabatically follows a coherent lattice oscillation at a frequency as high as 5.5 THz. The results suggest important implications for unconventional superconductivity. In a second step, we utilize the magnetic field component of intense THz transients to directly switch on and off coherent spin waves in the antiferromagnetic nickel oxide NiO. A femtosecond optical probe traces the magnetic dynamics in the time domain and verifies that the THz field addresses spins selectively via Zeeman interaction. This concept provides a universal ultrafast handle on magnetic excitations in the electronic ground state.

Citation Download Citation

K. W. Kim, M. Porer, C. Bernhard, J. Demsar, A. Pashkin, T. Kampfrath, A. Sell, M. Wolf, A. Leitenstorfer, and R. Huber "Ultrafast terahertz spin dynamics: from phonon-induced spin order to coherent magnon control", Proc. SPIE 8623, Ultrafast Phenomena and Nanophotonics XVII, 862307 (21 February 2013); https://doi.org/10.1117/12.2001236

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