Format

Send to

Choose Destination
Nat Commun. 2015 Apr 1;6:6733. doi: 10.1038/ncomms7733.

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

Author information

1
Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, 91405 Orsay, France.
2
Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502, 91405 Orsay, France.
3
Institut d'Electronique Fondamentale, Université Paris-Sud, CNRS UMR 8622, 91405 Orsay, France.
4
INAC-SPINTEC, Université Grenoble Alpes, CNRS, CEA, 38000 Grenoble, France.
5
INAC, CEA and Université Grenoble Alpes, 38054 Grenoble, France.
6
Singulus Technology AG, Hanauer Landstrasse 103, 63796 Kahl am Main, Germany.

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.

PMID:
25828294
DOI:
10.1038/ncomms7733

Supplemental Content

Full text links

Icon for Nature Publishing Group
Loading ...
Support Center