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).