SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.36: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Transport properties of systematically disordered Cr₂AlC films — •Joao S. Cabaco¹, Ulrich Kentsch¹, Jurgen Lindner¹, Jurgen Fassbender¹, Christoph Leyens^2,3, 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.