Jiadong Zang

Affiliations

• Department of Physics, University of New Hampshire, Durham, NH 03824, USA

Title

Symmetry analysis of skyrmionic helimagnets

Abstract

Magnetic skyrmion is a topological spin texture observed in several helimagnets. Inspired by the novel physics tracing back to its nontrivial topology and promising applications in next generation memory device and ultra-dense data storage, a full understanding of these materials is an urgent subject. We have analyzed the symmetry of a typical helimagnet family, the B20 compounds, and derived an effective description of the electron conduction therein, which explains recent experiments and suggests other predictions. On the other hand, a similar symmetry analysis leads to a full classification and search strategy of helimagnets. Based on this guideline, we discovered a new helimagnet family, the molybdenum nitride, harboring skyrmions, which is confirmed by magnetic imaging. Many interesting properties of molybdenum nitrides will also be addressed.

References

1. S. X. Huang, et al., Magnetoresistance due to broken C4 symmetry in cubic B20 chiral

magnets, arXiv:1409.7867.

2. S. X. Huang, et al., Universal resistivities of spin helix in (Fe-Co)Si, arXiv:1409.7869.

3. J. Kang and J. Zang, Transport theory of metallic B20 helimagnets, Phys. Rev. B 91,

134401 (2015).