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The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry

Author

Listed:
  • J.-P. Tetienne

    (Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan)

  • T. Hingant

    (Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan)

  • L.J. Martínez

    (Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan)

  • S. Rohart

    (Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502)

  • A. Thiaville

    (Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502)

  • L. Herrera Diez

    (Institut d'Electronique Fondamentale, Université Paris-Sud, CNRS UMR 8622)

  • K Garcia

    (Institut d'Electronique Fondamentale, Université Paris-Sud, CNRS UMR 8622)

  • J.-P. Adam

    (Institut d'Electronique Fondamentale, Université Paris-Sud, CNRS UMR 8622)

  • J.-V. Kim

    (Institut d'Electronique Fondamentale, Université Paris-Sud, CNRS UMR 8622)

  • J.-F. Roch

    (Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan)

  • I.M. Miron

    (INAC-SPINTEC, Université Grenoble Alpes, CNRS, CEA)

  • G. Gaudin

    (INAC-SPINTEC, Université Grenoble Alpes, CNRS, CEA)

  • L. Vila

    (INAC, CEA and Université Grenoble Alpes)

  • B. Ocker

    (Singulus Technology AG)

  • D. Ravelosona

    (Institut d'Electronique Fondamentale, Université Paris-Sud, CNRS UMR 8622)

  • V. Jacques

    (Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan)

Abstract

The capacity to propagate magnetic domain walls with spin-polarized currents underpins several schemes for information storage and processing using spintronic devices. A key question involves the internal structure of the domain walls, which governs their response to certain current-driven torques such as the spin Hall effect. Here we show that magnetic microscopy based on a single nitrogen-vacancy defect in diamond can provide a direct determination of the internal wall structure in ultrathin ferromagnetic films under ambient conditions. We find pure Bloch walls in Ta/CoFeB(1 nm)/MgO, while left-handed Néel walls are observed in Pt/Co(0.6 nm)/AlOx. The latter indicates the presence of a sizable interfacial Dzyaloshinskii–Moriya interaction, which has strong bearing on the feasibility of exploiting novel chiral states such as skyrmions for information technologies.

Suggested Citation

  • J.-P. Tetienne & T. Hingant & L.J. Martínez & S. Rohart & A. Thiaville & L. Herrera Diez & K Garcia & J.-P. Adam & J.-V. Kim & J.-F. Roch & I.M. Miron & G. Gaudin & L. Vila & B. Ocker & D. Ravelosona , 2015. "The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7733
    DOI: 10.1038/ncomms7733
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