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Topological Spin Textures in Chiral Magnets

Date: 2018-06-01
Time: 10:30
Venue: 中科院物理所M楼253
Speaker: Prof. Jiadong Zang (臧佳栋)

Department of Physics, University of New Hampshire, USA

Chiral magnets are a series of magnets with broken inversion symmetry. A new type of spin interaction therein, the Dzyaloshinskii-Moriya interaction, stimulates the formation of many novel topological spin textures. One typical example is the emergence of magnetic skyrmion, whose nontrivial topology enables unique dynamical property and thermal stability and gives out promise on future magnetic memory devise. Inspired by skyrmions, in this talk, I will give a comprehensive introduction of skyrmions and their behavior in confined geometries. I will also present three other relevant spin textures in chiral magnets. One is the target skyrmion we recently observed, both theoretically and experimentally, in ultra-small nanodisks of chiral magnets. Zero-field target skyrmions and their polarization switch will be discussed. Putting in heterostructures, we also found a new type of topological configuration dubbed the Hopfion therein. Finally, I will discuss emergent topology driven by thermal fluctuations.

Prof. Jiadong Zang joined University of New Hampshire in 2015 after 3 years in the Institute for Quantum Matter, Johns Hopkins University as a postdoctoral fellow. He received his PhD degree in physics from Fudan University. His major research interest is the theoretical condensed matter physics, with a recent focus on quantum matter, topological phenomena and non-equilibrium transport theories.