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Article Dans Une Revue Physical Review B Année : 2023

Magnon dispersion in ferromagnetic SrRuO 3

A. Tewari
A. Schneidewind
A A Nugroho
M. Braden

Résumé

The magnetic excitations in ferromagnetic SrRuO 3 were studied by inelastic neutron scattering combining experiments on triple-axis and time-of-flight spectrometers with and without polarization analysis. A quadratic spin-wave dispersion with an anisotropy gap describes the low-energy low-temperature response. The magnon dispersion extends to at least 35 meV and there is no direct evidence for a continuum of Stoner excitations below this energy. However, the magnon response is weakened at higher energy. In addition to the anomalous softening of the spin-wave stiffness and of the gap, which is induced by the topology of the Bloch states, the magnon excitations are broadened in energy and this effect increases upon heating.
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hal-04235135 , version 1 (10-10-2023)

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K. Jenni, S. Kunkemöller, A. Tewari, R A Ewings, Y. Sidis, et al.. Magnon dispersion in ferromagnetic SrRuO 3. Physical Review B, 2023, 107 (17), pp.174429. ⟨10.1103/PhysRevB.107.174429⟩. ⟨hal-04235135⟩
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