Abstract
Detailed spin-wave spectra of magnetoelectric ${\text{LiNiPO}}_{4}$ have been measured by neutron scattering at low temperatures in the commensurate (C) antiferromagnetic (AF) phase below ${T}_{N}=20.8\text{ }\text{K}$. An anomalous shallow minimum is observed at the modulation vector of the incommensurate (IC) AF phase appearing above ${T}_{N}$. A linear spin-wave model based on Heisenberg exchange couplings and single-ion anisotropies accounts for all the observed spin-wave dispersions and intensities. Along the $b$ axis an unusually strong next-nearest-neighbor AF coupling competes with the dominant nearest-neighbor AF exchange interaction and causes the IC structure.
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