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  • Unikandanunni, Vivek, 1993-, et al. (author)
  • Inertial Spin Dynamics in Epitaxial Cobalt Films
  • 2022
  • In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 129:23
  • Journal article (peer-reviewed)abstract
    • We investigate the spin dynamics driven by terahertz magnetic fields in epitaxial thin films of cobalt in its three crystalline phases. The terahertz magnetic field generates a torque on the magnetization which causes it to precess for about 1 ps, with a subpicosecond temporal lag from the driving force. Then, the magnetization undergoes natural damped THz oscillations at a frequency characteristic of the crystalline phase. We describe the experimental observations solving the inertial Landau-Lifshitz-Gilbert equation. Using the results from the relativistic theory of magnetic inertia, we find that the angular momentum relaxation time η is the only material parameter needed to describe all the experimental evidence. Our experiments suggest a proportionality between η and the strength of the magnetocrystalline anisotropy.
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Type of publication
journal article (1)
Type of content
peer-reviewed (1)
Author/Editor
Bonetti, Stefano (1)
Unikandanunni, Vivek ... (1)
Fullerton, Eric E. (1)
Medapalli, Rajasekha ... (1)
Asa, Marco (1)
Albisetti, Edoardo (1)
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Petti, Daniela (1)
Bertacco, Riccardo (1)
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University
Stockholm University (1)
Language
English (1)
Research subject (UKÄ/SCB)
Natural sciences (1)
Year
2022 (1)

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