期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-03240-w
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资金
- European Commission [ATOMS FP7/2007-2013-62260]
- Deutsche Forschungsgemeinschaft [Wu349/15-1]
- CAPES
- CNPq
- FAPEMIG
- Alexander von Humboldt Foundation
- Deutsche Forschungsemeinschaft [DU1489/2-1]
- Graduate School Materials Mainz
- ERC Synergy Grant SC2 [610115]
- Transregional Collaborative Research Center (SFB/TRR) [173 SPIN+X]
- Grant Agency of the Czech Republic [14-37427G]
- Deutsche Forschungsgemeinschaft
- Karlsruhe Institute of Technology
- Gutenberg University of Mainz
Skyrmions are topologically protected non-collinear magnetic structures. Their stability is ideally suited to carry information in, e.g., racetrack memories. The success of such a memory critically depends on the ability to stabilize and manipulate skyrmions at low magnetic fields. The non-collinear Dzyaloshinskii-Moriya interaction originating from spin-orbit coupling drives skyrmion formation. It competes with Heisenberg exchange and magnetic anisotropy favoring collinear states. Isolated skyrmions in ultra-thin films so far required magnetic fields as high as several Tesla. Here, we show that isolated skyrmions in a monolayer of Co/Ru(0001) can be stabilized down to vanishing fields. Even with the weak spin-orbit coupling of the 4d element Ru, homochiral spin spirals and isolated skyrmions were detected with spin-sensitive scanning tunneling microscopy. Density functional theory calculations explain the stability of the chiral magnetic features by the absence of magnetic anisotropy energy.
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