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Journal Articles Nature Communications Year : 2015

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.

Dates and versions

hal-01616539 , version 1 (13-10-2017)

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Cite

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, 2015, 6, pp.7733. ⟨10.1038/ncomms7733⟩. ⟨hal-01616539⟩
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