Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.68: Poster
Donnerstag, 8. September 2022, 16:00–18:00, P4
Transport properties of systematically disordered Cr2AlC films — •Joao S. Cabaco1, Ulrich Kentsch1, Jurgen Lindner1, Jurgen Fassbender1, Christoph Leyens2,3, Rantej Bali1, and Richard Boucher2 — 1Institute of Ion Beam Physics and Materials Research, Helmholz Zentrum, Dresden-Rossendorf, Germany — 2Institute for Materials Science, TU Dresden, Germany — 3Fraunhofer Institute for Material and Beam Technology IWS, Dresden, Germany.
Nano-lamellar composite materials, known as MAX-phases, can possess a combination of ceramic and metallic properties. A prototype compound is Cr2AlC, formed from a unit cell of Cr2C sandwiched between atomic planes of Al.
In this work we study the modifications to the structural, transport and magnetic behavior of 500 nm thick Cr2AlC after irradiation with Co+ ions, and Ar+ noble gas ions as control. X-ray diffraction shows that ion-irradiation induces a suppression of the 0002 reflection, indicating a deterioration of the crystal structure. Increasing the ion fluence leads to an increase of the saturation magnetization at 1.5 K, whereby both Ar+ and Co+ cause an increased magnetization, respectively to 150 kA.m−1 and 190 kA.m−1, for the highest fluences used. At Co+ fluences of 5×1013 ions.cm−2 the magnetoresistance (MR) shows a 2-order of magnitude increase, up to 3% (10 T) at 100 K. A similar effect also occurs for 5×1012 ions.cm−2 Ar+ irradiated films, however, with a smaller MR-increase. The disordering of MAX phase films may reveal interesting spin-related transport phenomena.