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

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 and V. Jacques ()
Additional contact information
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

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7733

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