Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Magnetic Heuslers, Half-metals and Oxides I (with TT)
MA 4.6: Talk
Monday, March 31, 2014, 10:45–11:00, BEY 118
Atom Probe Tomography of Thin Film Magnetic Heusler Alloy Interfaces — •Torben Boll1, Niclas Teichert2, Andreas Hütten2, and Talaat Al-Kassab1 — 1King Abdullah University of Science and Technology (KAUST), Division of Physical Sciences and Engineering, Thuwal 23955-6900, Saudi Arabia — 2Bielefeld University, Thin Film and Physics of Nanostructures, Universitätsstr. 25, 33615 Bielefeld, Germany
NiMn-X ferromagnetic shape memory alloys have been gaining interest for various applications. For microelectronic devices these alloys have to be made available as thin films. The properties of these films are dominated by the microstructure and especially the interfaces between different layers.
For this study thin film samples of NiMnGa-NiMnSn grown on MgO or Si substrates were prepared by magnetron sputtering. The system was covered with an additional layer of Ag or Ni for protection. Then needle shaped specimens, as required for atom probe tomography, were cut out by means of focused ion beam preparation. The NiMnGa-NiMnSn interface and the MgO-metal interface were characterized with a Local Electrode Atom Probe (LEAP) 4000 HR and a Laser Assisted Wide Angle Tomographic Atom Probe (LAWATAP).