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MA: Fachverband Magnetismus
MA 62: Disodered Magnetic Materials
MA 62.4: Vortrag
Freitag, 20. März 2020, 10:15–10:30, HSZ 401
Local structure after ion irradiation in FeRh thin films — •Johanna Lill1, Benedikt Eggert1, Katharina Ollefs1, Sakura Pascarelli2, Alexander Schmeink3,4, Kay Potzger3, Jürgen Lindner3, Jürgen Fassbender3,4, Thomas Thomson5, Rantej Bali3, and Heiko Wende1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2ESRF, Grenoble, France — 3Helmholtz-Zentrum Dresden-Rossendorf, Germany — 4Dresden University of Technology, Germany — 5The University of Manchester, United Kingdom
B2 FeRh shows antiferromagnetic ordering in the thermodynamic stable phase, while the disordered structure exhibits a ferromagnetic and paramagnetic ordering. The disordered structure can be induced by ion irradiation [1]. In this work we investigate FeRh thin films for different irradiation fluences of 110 keV Ne+ by Fe K edge Extended X-ray absorption fine structure spectrosopy at low temperatures. For low irradiation fluences, we see an increase of the lattice parameter and an increase of static disorder by analysis of the mean square relative displacement. For higher fluences a change from the bcc to the fcc phase occurs. In addition, XRD measurements show similar behaviour to the EXAFS findings. From magnetometry, we determine an increase of the magnetisation and a shift of the phase transition to lower temperatures with rising irradiation fluence.
Financial support by DFG (WE 2623/14-1) is acknowledged.
[1] A. Heidarian et al. J. Nucl Inst. Meth. B 358, 251 (2015)