Spin-orbit coupling in transition-metal oxides entangles lattice, charge, and spin degrees of freedom to generate unconventional magnetic states. In Sn-doped ${\mathrm{Ca}}_{\text{2}}{\mathrm{RuO}}_{\text{4}}$, compression of the ${\mathrm{RuO}}_6$ octahedra enhances the ${\mathrm{Ru}}^{4+}$-ordered moment and drives $a$-axis spin canting via Dzyaloshinskii-Moriya interactions from staggered octahedral tilts and rotations. Neutron diffraction, depolarization, and magnetization measurements reveal a canted component ($\alpha \approx 2.{92}^{\circ }$) together with a weak ferromagnetic response. These results demonstrate that tetragonal compression stabilizes an in-plane canted AFM state with enhanced moment, establishing it as an effective lever to engineer spin-orbit entangled magnetism in layered ruthenates.

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• Strongly correlated systems
• Magnetization measurements
• Neutron diffraction