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Poster De Conférence Année : 2022

Laser-induced ultrafast demagnetization and perpendicular magnetic anisotropy reduction in a Co88Tb12 thin film with stripe domains

Grégory Malinowski
Michel Hehn
Daniel Lacour
Flavio Capotondi
Emanuele Pedersoli
Ivaylo Nikolov

Résumé

We use time-resolved x-ray resonant magnetic scattering (TR-XRMS) at the Co M 2,3 and Tb O 1 edges to studyultrafast demagnetization in an amorphous Co 88 Tb 12 alloy with stripe domains. Combining the femtosecond temporal with nanometer spatial resolution of our experiment, we demonstrate that the equilibrium spin texture of the thin film remains unaltered by the optical pump pulse on ultrashort timescales (< 1 ps). However, after 4 ps, we observe the onset of a significant domain wall broadening, which we attribute to a reduction of the uniaxial magnetic anisotropy of the system, due to energy transfer to the lattice. Static temperature-dependent magnetometry measurements combined with analytical modeling of the magnetic structure of the thin film corroborate this interpretation.
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Dates et versions

hal-03974509 , version 1 (05-02-2023)

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Paternité

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  • HAL Id : hal-03974509 , version 1

Citer

Marcel Hennes, Alaa El Dine Merhe, Xuan Liu, David Weder, Clemens von Korff Schmising, et al.. Laser-induced ultrafast demagnetization and perpendicular magnetic anisotropy reduction in a Co88Tb12 thin film with stripe domains. Ultrafast Magnetic Conference, Sep 2022, Nancy, France. 2022. ⟨hal-03974509⟩
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