We report a systematic study of the anisotropic magnetic, magnetocaloric, and magnetotransport properties of ${\mathrm{DyAgSb}}_2$ single crystals, which order antiferromagnetically and exhibit strong easy-plane anisotropy that constrains the Dy moments within the basal plane. Isothermal magnetization measurements reveal successive metamagnetic transitions for in-plane magnetic fields, in contrast to the weak and nearly linear hard-axis response for ${\mu }_{0}H//\left[001\right]$ up to 7 T. The associated field-induced phase evolution produces a strongly anisotropic magnetic entropy change: For $\mathrm{\Delta }{\mu }_{0}H=7\mathrm{T}$, the peak values of $-\mathrm{\Delta }{S}_{\mathrm{M}}$ are 14.78 and $12.74\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$ for [110] and [100], respectively. Along [001], an inverse magnetocaloric response yields a minimum of $-\mathrm{\Delta }{S}_{\mathrm{M}}=-5.17\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$. The corresponding rotating entropy changes are $15.2\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$ and $13.96\mathrm{J}\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{K}}^{-1}$ for the [001]/[110] and [001]/[100] rotation pairs, respectively. Field-dependent magnetoresistance (MR) exhibits anomalies in the field ranges associated with the in-plane metamagnetic transitions, whereas the hard-axis transverse geometry exhibits a smooth positive MR reaching about $3\times {10}^2\%$ at 2 K and 7 T. A joint analysis of the paramagnetic susceptibility and magnetization isotherms using a crystalline electric field (CEF) plus molecular-field model supports the contribution of single-ion CEF effects to the easy-plane anisotropy. These results reveal a correspondence between the anisotropic magnetic-state evolution, magnetic entropy changes, and magnetotransport anomalies.

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• Magnetic anisotropy
• Magnetocaloric effect
• Magnetotransport
• Rare-earth magnetic materials