Magnetoelastic coupling and magnetic anisotropy in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>Sm</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi>CoFeO</mml:mi> <mml:mn>6</mml:mn> </mml:msub> </m

The coupling between strain and magnetic order arises due to the modifications in orbital overlap and crystal field symmetry, giving rise to strain-induced magnetic anisotropy. Here, we find an evolution of strain-tuned out-of-plane magnetic anisotropy in thin films of double perovskite ${\mathrm{Sm}}_{2}{\mathrm{CoFeO}}_{6}$, which possesses room-temperature ferromagnetism. Notably, the magnetization of the thin films is enhanced nearly 40 times compared to its bulk value, making a strong case for strain-induced ferromagnetism. The intrinsic magnetic anisotropy constant increases from 3 ${\mathrm{kJ}/\mathrm{m}}^{3}$ to 120 ${\mathrm{kJ}/\mathrm{m}}^{3}$ with the application of tensile strain from 0.7% to 2%. The magnetostriction coefficient is estimated to be as large as $30\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. The strain-induced ferromagnetism in ${\mathrm{Sm}}_{2}{\mathrm{CoFeO}}_{6}$ is well supported with density functional theory calculations. Such magnetoelastic coupling-driven magnetic anisotropy tuning is further discussed in the micromagnetic framework.