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

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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

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
DOIs
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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