Nonlinear Magnetization Dynamics Driven by Strong Terahertz Fields
- Stockholm Univ. (Sweden)
- Univ. of Naples Federico II (Italy)
- IBM Almaden Research Center, San Jose, CA (United States)
- IBM Almaden Research Center, San Jose, CA (United States); Max-Planck Inst. für Mikrostrukturphysik, Halle (Germany)
- Uppsala Univ. (Sweden)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Stockholm Univ. (Sweden); Ca’ Foscari Univ. of Venice, Venezia Mestre (Italy)
We present a comprehensive experimental and numerical study of magnetization dynamics in a thin metallic film triggered by single-cycle terahertz pulses of ~20 MV/m electric field amplitude and ~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.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Swedish Research Council (SRC); European Research Council (ERC)
- Grant/Contract Number:
- AC02-76SF00515; E0635001; 2015-SLAC-100238; 715452
- OSTI ID:
- 1608990
- Journal Information:
- Physical Review Letters, Vol. 123, Issue 19; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Analysis in k-Space of Magnetization Dynamics Driven by Strong Terahertz Fields
|
journal | February 2021 |
All-optical non-linear chiral ultrafast magnetization dynamics driven by circularly polarized magnetic fields | preprint | January 2022 |
Similar Records
Low frequency terahertz-induced demagnetization in ferromagnetic nickel
Magnetization dynamics in NiFe thin films induced by short in-plane magnetic field pulses