SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Electron Theory of Magnetism and Correlations
MA 27.5: Vortrag
Mittwoch, 29. März 2023, 10:45–11:00, HSZ 403
Influence of the temperature on the relation between the magnetic hyperfine field and the magnetic moment — •Ondrej Sipr1,2 and Hubert Ebert3 — 1Institute of Physics, Czech Academy of Sciences, Praha — 2New Technologies Research Centre, University of West Bohemia, Plzeň — 3Ludwig-Maximilians-Universität München
The magnetic hyperfine field Bhf is often used to probe magnetism in alloys, compounds and doped systems in an element-specific way. Accompanying this is the question about the relationship between Bhf and the magnetic moment. It was shown before both experimentally and theoretically that the ratio between Bhf and the magnetic moment depends on the alloy system and the composition. Here, we apply ab initio calculations to investigate how Bhf and its relation to the magnetic moment depend on the temperature.
We find that the contribution of the core electrons to Bhf is indeed proportional to the magnetic moment over the whole temperature range, from zero up to the Curie temperature. However, the temperature-dependence of the contribution of the valence electrons is more complicated and as a result of this, the ratio between the total Bhf and the magnetic moment significantly varies with the temperature. Based on our theoretical results, we show that probing element-specific magnetism by means of measuring the magnetic hyperfine field and by measuring the x-ray magnetic circular dichroism will lead in general to different pictures.