Field-induced magnetic structures in the chiral polar antiferromagnet Ni${}_2$InSbO${}_6$

Abstract

We have performed ${}^{115}$In-NMR spectroscopy for Ni${}_2$InSbO${}_6$ with corundum-related crystal structure to reveal magnetic structures that develop in high magnetic fields. At low fields Ni${}_2$InSbO${}_6$ shows a helical magnetic order with a long wavelength because of its chiral and polar crystal structure. The field-induced magnetic state was not investigated by microscopic experiment because an extremely high magnetic field is required to modify the antiferromagnetically coupled helical structure. From the analysis of our ${}^{115}$In-NMR spectra obtained at high magnetic fields, we confirm that the canted antiferromagnetic structure appears in fields applied in the $[110]$ direction and the propagation vector of magnetic helix is rotated toward the field direction for fields in the $[001]$ direction. We discuss the effect of magnetic field that modifies the magnetic structure of an antiferromagnetic chiral magnet.

9 pages, 8 figures, accepted for publication from Phys. Rev. B

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