Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.197204
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Funding
- Swedish Research Council [E0635001]
- Marie Sklodowska Curie Actions [INCA 600398s]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [2015-SLAC-100238]
- European Research Council [715452]
- European Research Council (ERC) [715452] Funding Source: European Research Council (ERC)
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We present a comprehensive experimental and numerical study of magnetization dynamics in a thin metallic film triggered by single-cycle terahertz pulses of similar to 20 MV/m electric field amplitude and similar to 1 ps duration. The experimental dynamics is probed using the femtosecond magneto-optical Kerr effect, and it is reproduced numerically using macrospin simulations. The magnetization dynamics can be decomposed in three distinct processes: a coherent precession of the magnetization around the terahertz magnetic field, an ultrafast demagnetization that suddenly changes the anisotropy of the film, and a uniform precession around the equilibrium effective field that is relaxed on the nanosecond time scale, consistent with a Gilbert damping process. Macrospin simulations quantitatively reproduce the observed dynamics, and allow us to predict that novel nonlinear magnetization dynamics regimes can be attained with existing tabletop terahertz sources.
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