Magnetic anisotropy tuning in room temperature ferromagnet Ca_2FeMoO_6

Magnetic anisotropy is often tuned through various approaches, including chemical substitution, shape engineering, defect manipulation, and strain.Here, we demonstrate the strain-mediated control of magnetic in room-temperature ferromagnetic Ca 2 FeMoO 6 . In particular, the anisotropy constant (Ku) is tuned from -30 kJ/m 3 (in-plane) to 180 kJ/m 3 (out-of-plane) via substrate-driven tensile strain (0.9%) in thin films. We argue that the negative value of magnetostriction promotes out-of-plane anisotropy through magnetoelastic coupling in Ca 2 FeMoO 6 films. In addition, the experimental results are well supported by micromagnetic simulations. Our results show that even modest tensile strain is sufficient to induce easy-axis reorientation in double perovskite Ca 2 FeMoO 6 through strong magnetoelastic coupling.