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Co-sputtered PtMnSb thin films and PtMnSb/Pt bilayers for spin-orbit torque investigations

Krieft, J., Mendil, J., Aguirre, M. H., Avci, C. O., Klewe, C., Rott, K., Schmalhorst, J-M., Reiss, G., Gambardella, P. & Kuschel, T., Apr-2017, In : Physica status solidi-Rapid research letters. 11, 4, 7 p., 1600439.

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  • Co-sputtered PtMnSb thin films and PtMnSb/Pt bilayers for spin-orbit torque investigations

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DOI

  • Jan Krieft
  • Johannes Mendil
  • Myriam H. Aguirre
  • Can O. Avci
  • Christoph Klewe
  • Karsten Rott
  • Jan-Michael Schmalhorst
  • Guenter Reiss
  • Pietro Gambardella
  • Timo Kuschel

The manipulation of the magnetization by spin-orbit torques (SOTs) has recently been extensively studied due to its potential for efficiently writing information in magnetic memories. Particular attention is paid to non-centrosymmetric systems with space inversion asymmetry, where SOTs emerge even in single-layer materials. The half-metallic half-Heusler PtMnSb is an interesting candidate for studies of this intrinsic SOT. Here, we report on the growth and epitaxial properties of PtMnSb thin films and PtMnSb/Pt bilayers deposited on MgO(001) substrates by dc magnetron co-sputtering at high temperature in ultra-high vacuum. The film properties were investigated by X-ray diffraction, X-ray reflectivity, atomic force microscopy, and electron microscopy. Thin PtMnSb films present a monocrystalline C1b phase with (001) orientation, coexisting at increasing thickness with a polycrystalline phase with (111) texture. Films thinner than about 5 nm grow in islands, whereas thicker films grow ultimately layer-by-layer, forming a perfect MgO/PtMnSb interface. The thin PtMnSb/Pt bilayers also show island growth and a defective transition zone, while thicker films grow layer-by-layer and Pt grows epitaxially on the half-Heusler compound without significant interdiffusion. (C) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Original languageEnglish
Article number1600439
Number of pages7
JournalPhysica status solidi-Rapid research letters
Volume11
Issue number4
Publication statusPublished - Apr-2017

    Keywords

  • PtMnSb, Pt, half-Heusler alloys, spin-orbit torques, magnetron sputtering, thin films, MAGNETOOPTICAL PROPERTIES, NIMNSB, MAGNETORESISTANCE, LAYER

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