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7 9 I H I G H L I G H T S 2 0 2 3

PRINCIPAL PUBLICATION AND AUTHORS

A multi-stage first-order magnetic phase transition in LaFe11.8Si1.2: Interplay between the structural, magnetic, and electronic degrees of freedom, K.P. Skokov (a), A.Y. Karpenkov (a), D.Y. Karpenkov (a), I A. Radulov (a), D. Günzing (b), B. Eggert (b), A. Rogalev (c), F. Wilhelm (c), J. Liu (d,e), Y. Shao (d), K. Ollefs (b), M.E. Gruner (b), H. Wende (b), O. Gutfleisch (a), Appl. Phys. Rev. 10, 031408 (2023); https:/doi.org/10.1063/5.0133411 (a) Functional Materials, TU Darmstadt, Darmstadt (Germany) (b) ESRF (c) Faculty of Physics, University of Duisburg-Essen, Duisburg (Germany) (d) Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Ningbo (China) (e) School of Materials Science and Engineering, Shanghai University, Shanghai (China)

Fig. 59: a) Magnetisation m(H) (red) together with volume changes ω(H) (blue) measured quasistatically at 186 K, the field sweep rate was 0.1 Oe/s. b) Major (dashed line) and minor (solid lines) hysteresis loops m(H) and ω(H); minor loops were measured with 30 min dwell between demagnetisation and magnetisation. The temperature change of the sample is plotted at the bottom. c) Differences of the XAS spectra recorded at different field values with respect to the XAS spectrum recorded at 2.4 T [diff(XAS) = XAS(E,μ0H)-XAS(E, 2.4 T)]. The inset shows the XAS (red line) and XMCD (blue line) spectra measured at 187 K and under an applied field of 2.4 T. d) Variation in XAS intensity at photon energies of 7110.8 eV (red dots) and an energy shift of the absorption edge (blue dots) as a function of applied magnetic field. The solid black line depicts the magnetic field dependence of the integrated XMCD signal. The dashed line is a guide for the eye to follow the XAS signal together with the energy shift of the XAS data as a function of μ0H.