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Magnetic skyrmions, which are topologically distinct magnetic spin textures,are gaining increased attention for their unique physical properties andpotential applications in spintronic devices. Here we present a design strategyfor skyrmion host candidates based on combinations of magnetic spin, asymmetricbuilding units having stereo-active lone-pair electrons, and polar latticesymmetry. To demonstrate the viability of the proposed rational designprinciples, we successfully synthesized Fe(IO3)3 polycrystalline sample andsingle crystals by using a new simplified low-temperature pathway, which isexperimentally feasible for extending materials growth of transition metaliodates. Single crystal X-ray and powder synchrotron X-ray diffractionmeasurements demonstrated that Fe(IO3)3 crystallizes in the polar chiralhexagonal lattice with space group P63. The combined structural features of themacroscopic electric polarization along the c axis stemming from thecoalignment of the stereo-active lone-pairs of the IO3 trigonal pyramid and themagnetic Fe3+cation residing on the three-fold rotation axis were selected topromote asymmetric exchange coupling. We find evidence of a predicted skyrmionphase at 14 K to 16 K and 2.5 T to 3.2 T driven by Dzyaloshinskii Moriya (DM)interaction, a conclusion supported by the appreciable DM exchange and thezero-field spiral antiferromagnetic ground state of Fe(IO3)3 deduced fromneutron diffraction experiments. The associated magnetic modulation wavelengthof the putative skyrmions is expected to be short, approximately 18 nm,comparable to the period of the DM-driven incommensurate order. This work linksstereo-active lone-pair electron effects to enhanced DM interaction,demonstrating a new approach for chemical guidelines in the search forskyrmionic states of matter.

Potential Skyrmion Host Fe(IO3)3: Connecting Stereo-active Lone-Pair Electron Effects to the Dzyaloshinskii-Moriya Interaction