SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.36: Poster
Thursday, September 30, 2021, 13:30–16:30, P
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, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institute for Materials Science, Technische Universität Dresden, Dresden, Germany — 3Fraunhofer Institute for Material and Beam Technology IWS Dresden, 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. Here we observe 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 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 orders 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.