Laser-induced ultrafast demagnetization and perpendicular magnetic anisotropy reduction in a Co88Tb12 thin film with stripe domains - Archive ouverte HAL Access content directly
Journal Articles Physical Review B Year : 2020

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

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B. Mahieu
Grégory Malinowski
M. Hehn
D Lacour

Abstract

We use time-resolved x-ray resonant magnetic scattering (TR-XRMS) at the Co M2,3 and Tb O1 edges to study ultrafast demagnetization in an amorphous Co88Tb12 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 (<1ps). 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 and versions

hal-03032944 , version 1 (01-12-2020)

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Marcel Hennes, Aladine Merhe, Xuan Liu, D. Weder, C von Korff Schmising, et al.. Laser-induced ultrafast demagnetization and perpendicular magnetic anisotropy reduction in a Co88Tb12 thin film with stripe domains. Physical Review B, 2020, 102, pp.174437. ⟨10.1103/physrevb.102.174437⟩. ⟨hal-03032944⟩
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