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We study how spin and orbital effects influence the capability of promotingDzyaloshinskii-Moriya (DM) interaction by studying the two magnetic polarmaterials, Cu(IO3)2 (S = 1/2 with orbital contribution) and Mn(IO3)2 (S = 5/2with quenched orbital magnetism) and connecting their electronic and magneticproperties with their structures. The chemically controlled low-temperaturesynthesis of these complexes resulted in pure polycrystalline samples,providing a viable pathway to prepare bulk forms of transition-metal io-dates.Rietveld refinements of the powder synchrotron X-ray diffraction data revealthat these materials exhibit different crystal structures but crystallize inthe same polar and chiral P21 space group, giving rise to an electricpolarization along the b-axis direction. The presence and absence of an evidentphase transition to a possible topologically distinct state observed inCu(IO3)2 and Mn(IO3)2, respectively, implies the important role of spin-orbitcoupling. Neutron diffraction experiments reveal helpful insights into themagnetic ground state of these materials. While the long-wavelengthincommensurability of Cu(IO3)2 is in harmony with orbital effects andanisotropic magnetic exchange, the commensurate stripe AFM ground state ofMn(IO3)2 is attributed to quenched orbital angular momentum and isotropicmagnetic coupling. The work demonstrates connections between combined spin andorbital effects, magnetic coupling dimensionality and DM exchange, providing aworthwhile approach for tuning asymmetric interaction which promotes evolutionof topologically distinct spin phases.

Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO3)2 (M = Cu, Mn)