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 a magnetic field that modifies the magnetic structure of an antiferromagnetic chiral magnet.
Neutron diffraction and nuclear magnetic resonance (NMR) measurements have been used to analyze the magnetic structure in the S = 1 2 kagome antiferromagnet CdCu 3 (OH) 6 (NO 3 ) 2 • H 2 O. Below the magnetic ordering temperature T N 4 K, magnetic Bragg reflections at (101) and (100) were found in the neutron diffraction pattern, which suggests a q = 0 magnetic structure. Furthermore, the vector spin chirality for the q = 0 structure was successfully identified from the internal field direction obtained by the 14 N-NMR measurement, previous magnetization measurements, and magnetic symmetry analysis. Our findings point to a chirality-ordered magnetic structure with negative vector chirality and 100 anisotropy.
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