Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Thin films – anisotropy

MA 42.11: Vortrag

Donnerstag, 15. März 2018, 12:15–12:30, EB 301

Element-resolved vibrational density of states of FeRh thin films along the metamagnetic phase transition — •Benedikt Eggert¹, Joachim Landers¹, Soma Salamon¹, Alexandra Terwey¹, Alexander Schmeink², Ahmet Alatas³, Thomas Toellner³, Michael Y. Hu³, Jiyong Zhao³, E. Ercan Alp³, Markus E. Gruner¹, Kay Potzger², Jürgen Lindner², Katharina Ollefs¹, Rantej Bali², Werner Keune¹, and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Germany — ³Argonne National Laboratory, USA

B2-ordered FeRh shows a temperature induced first-order metamagnetic phase transition from the antiferromagnetic (AFM) to the ferromagnetic (FM) state. By applying ⁵⁷Fe nuclear resonant inelastic X-Ray scattering to epitaxial B2 ordered FeRh(001) thin films, we determined the Fe-projected vibrational density of states (VDOS) and the vibrational entropy change through the transition with and without an applied magnetic field. The Lamb-Mössbauer factor indicates that the AFM lattice is softer than the FM one [1]. In films with different thicknesses we find a small change in the VDOS due to varying film strain, induced by the MgO(001) substrate. Financial support by DFG (WE 2623/17-1) and U.S. DOE is acknowledged.
[1] M. Wolloch et al. Phys. Rev. B 94, 174435 (2016)