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Single crystal neutron diffraction, inelastic neutron scattering, bulkmagnetization measurements, and first-principles calculations are used toinvestigate the magnetic properties of the honeycomb lattice $\rmTb_2Ir_3Ga_9$. While the $R\ln2$ magnetic contribution to the low-temperatureentropy indicates a $\rm J_{eff}=1/2$ moment for the lowest-energycrystal-field doublet, the Tb$^{3+}$ ions form a canted antiferromagneticstructure below 12.5 K. Due to the Dzyalloshinskii-Moriya interactions, the Tbmoments in the $ab$ plane are slightly canted towards $b$ by $6^\circ$ with acanted moment of 1.22 $\mu_{\rm B} $ per formula unit. A minimal $xxz$ spinHamiltonian is used to simultaneously fit the spin-wave frequencies along thehigh symmetry directions and the field dependence of the magnetization alongthe three crystallographic axes. Long-range magnetic interactions for bothin-plane and out-of-plane couplings up to the second nearest neighbors areneeded to account for the observed static and dynamic properties. The $z$component of the exchange interactions between Tb moments are larger than the$x$ and $y$ components. This compound also exhibits bond-dependent exchangewith negligible nearest exchange coupling between moments parallel andperpendicular to the 4$f$ orbitals. Despite the $J_{{\rm eff}}=1/2$ moments,the spin Hamiltonian is denominated by a large in-plane anisotropy $K_z \sim-1$ meV. DFT calculations confirm the antiferromagnetic ground state and thesubstantial inter-plane coupling at larger Tb-Tb distances.

Canted antiferromagnetic order and spin dynamics in the honeycomb-lattice Tb2Ir3Ga9