Oxygen-enabled control of Dzyaloshinskii-Moriya Interaction in ultra-thin magnetic films

Abstract
The search for chiral magnetic textures in systems lacking spatial inversion symmetry has attracted a massive amount of interest in the recent years with the real space observation of novel exotic magnetic phases such as skyrmions lattices, but also domain walls and spin spirals with a defined chirality. The electrical control of these textures offers thrilling perspectives in terms of fast and robust ultrahigh density data manipulation. A powerful ingredient commonly used to stabilize chiral magnetic states is the so-called Dzyaloshinskii-Moriya interaction (DMI) arising from spin-orbit coupling in inversion asymmetric magnets. Such a large antisymmetric exchange has been obtained at interfaces between heavy metals and transition metal ferromagnets, resulting in spin spirals and nanoskyrmion lattices. Here, using relativistic first-principles calculations, we demonstrate that the magnitude and sign of DMI can be entirely controlled by tuning the oxygen coverage of the magnetic film, therefore enabling the smart design of chiral magnetism in ultra-thin films. We anticipate that these results extend to other electronegative ions and suggest the possibility of electrical tuning of exotic magnetic phases.

Citation
Oxygen-enabled control of Dzyaloshinskii-Moriya Interaction in ultra-thin magnetic films 2016, 6:24634 Scientific Reports

Acknowledgements
A.B. and A.M. acknowledge financial support from the King Abdullah University of Science and Technology (KAUST). We acknowledge computing time on the supercomputers SHAHEEN, NOOR, and SMC at KAUST Supercomputing Centre and JUROPA at the Jülich Supercomputing Centre (JSC).

Publisher
Springer Nature

Journal
Scientific Reports

DOI
10.1038/srep24634

PubMed ID
27103448

arXiv
1511.01614

Additional Links
http://www.nature.com/articles/srep24634

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