NMR observation of the spin structure and field induced spin reorientation in YFeO3

For the first time the ⁵⁷Fe NMR spectrum of the nuclei in the domains of a YFeO₃ single crystal has been observed. The splitting of the lines by an external magnetic field allows a very exact determination of the spin orientation of the four Fe sublattices. The ferro- and antiferromagnetic canting angles in zero field are φ = 12.3 mrad and ψ = 14.0 mrad, respectively. The field-induced spin reorientation can be described using the model of antisymmetric exchange interaction including second- and fourth-order anisotropy constants.