SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.37: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Local structure in FeRh thin films after ion irradiation — •Johanna Lill1, Benedikt Eggert1, Katharina Ollefs1, Sakura Pascarelli2, Alexander Schmeink3,4, Kay Potzger3, Jürgen Lindner3, Jürgen Fassbender3,4, William Griggs5, 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
Equiatomic B2 FeRh exhibits antiferromagnetic ordering at room temperature and undergoes a meta-magnetic phase transition to ferromagnetic ordering at 370K. Ferromagnetic ordering can also be induced by structural disorder caused by moderate ion irradiation [1]. Larger irradiation fluence results in a paramagnetic state. 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 find an increase of the lattice parameter and a decrease of the Debye-Waller-factor, while for higher fluences a change from the bcc to the fcc phase occurs. XRD as well as magnetometry results confirm the phase transitions, and are consistent with the EXAFS findings. From magnetometry, we see an increase of the magnetisation and a shift of the phase transition to lower temperatures with rising irradiation fluence.
Financial support by DFG (WE 2623/14-2 and BA 5656/1-2) is acknowledged.
[1] W. Griggs et al. APL Mater. 8, 121103 (2020)