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

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 Neel 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.
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Contributor : Jérôme Planès <>
Submitted on : Friday, October 13, 2017 - 5:55:47 PM
Last modification on : Monday, June 21, 2021 - 4:31:33 PM

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J. P. Tetienne, T. Hingant, L. J. Martinez, S. Rohart, André Thiaville, et al.. The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry. Nature Communications, Nature Publishing Group, 2015, 6, pp.7733. ⟨10.1038/ncomms7733⟩. ⟨hal-01616539⟩



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