Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Focus Session: Magnetic materials for energy efficient applications

MA 11.3: Vortrag

Montag, 1. April 2019, 16:45–17:00, H38

Microscopic insights into the disorder induced phase transition in FeRh thin films — •Benedikt Eggert¹, Alexander Schmeink^2,3, Kay Potzger², Jürgen Lindner², Jürgen Fassbender^2,3, Katharina Ollefs¹, Werner Keune¹, Rantej Bali², and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Germany — ³Dresden University of Technology, Germany

By employing ⁵⁷Fe conversion electron Mössbauer spectroscopy, we qualitatively determined the changes of the microscopic Fe moment of chemical disordered epitaxial B2-FeRh(001) thin films, where the chemical disorder has been induced by ion irradiation with Ne⁺. Apart from the initial magnetic splitting at 25.4 T an additional sextet contribution arises with an hyperfine field of 27.4 T. A comparison between the structural disorder and the temperature induced phase transition shows a similar change of the ⁵⁷Fe hyperfine field as a function of the macroscopic magnetisation. This gives an indirect indication, that the metamagnetic phase transition proceeds via a defect-driven domain nucleation of ferromagnetic domains in the antiferromagnetic matrix, as it was suggested based on XPEEM and nano-XRD measurements along the phase transition [1]. We would like to thank the Ion Beam Center at Helmholtz-Zentrum Dresden-Rossendorf for providing the necessary facilities and acknowledge the financial support by DFG (WE2623/17-1).
D. Keavney et al. Scientific Reports 8 1778 (2018)