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Title: Nonlinear Magnetization Dynamics Driven by Strong Terahertz Fields

Abstract

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.

Authors:
 [1];  [2]; ORCiD logo [1];  [3];  [3];  [4];  [5];  [2];  [6]; ORCiD logo [7]
  1. Stockholm Univ. (Sweden)
  2. Univ. of Naples Federico II (Italy)
  3. IBM Almaden Research Center, San Jose, CA (United States)
  4. IBM Almaden Research Center, San Jose, CA (United States); Max-Planck Inst. für Mikrostrukturphysik, Halle (Germany)
  5. Uppsala Univ. (Sweden)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Stockholm Univ. (Sweden); Ca’ Foscari Univ. of Venice, Venezia Mestre (Italy)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swedish Research Council (SRC); European Research Council (ERC)
OSTI Identifier:
1608990
Grant/Contract Number:  
AC02-76SF00515; E0635001; 2015-SLAC-100238; 715452
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Hudl, Matthias, d’Aquino, Massimiliano, Pancaldi, Matteo, Yang, See-Hun, Samant, Mahesh G., Parkin, Stuart S. P., Dürr, Hermann A., Serpico, Claudio, Hoffmann, Matthias C., and Bonetti, Stefano. Nonlinear Magnetization Dynamics Driven by Strong Terahertz Fields. United States: N. p., 2019. Web. doi:10.1103/physrevlett.123.197204.
Hudl, Matthias, d’Aquino, Massimiliano, Pancaldi, Matteo, Yang, See-Hun, Samant, Mahesh G., Parkin, Stuart S. P., Dürr, Hermann A., Serpico, Claudio, Hoffmann, Matthias C., & Bonetti, Stefano. Nonlinear Magnetization Dynamics Driven by Strong Terahertz Fields. United States. doi:https://doi.org/10.1103/physrevlett.123.197204
Hudl, Matthias, d’Aquino, Massimiliano, Pancaldi, Matteo, Yang, See-Hun, Samant, Mahesh G., Parkin, Stuart S. P., Dürr, Hermann A., Serpico, Claudio, Hoffmann, Matthias C., and Bonetti, Stefano. Fri . "Nonlinear Magnetization Dynamics Driven by Strong Terahertz Fields". United States. doi:https://doi.org/10.1103/physrevlett.123.197204. https://www.osti.gov/servlets/purl/1608990.
@article{osti_1608990,
title = {Nonlinear Magnetization Dynamics Driven by Strong Terahertz Fields},
author = {Hudl, Matthias and d’Aquino, Massimiliano and Pancaldi, Matteo and Yang, See-Hun and Samant, Mahesh G. and Parkin, Stuart S. P. and Dürr, Hermann A. and Serpico, Claudio and Hoffmann, Matthias C. and Bonetti, Stefano},
abstractNote = {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.},
doi = {10.1103/physrevlett.123.197204},
journal = {Physical Review Letters},
number = 19,
volume = 123,
place = {United States},
year = {2019},
month = {11}
}

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