The angle-dependent in-plane magnetostriction of polycrystalline CoFe2O4 film

The optical cantilever beam magnetometer (CBM) setup was used to investigate the angle-dependent in-plane magnetostriction of a polycrystalline CoFe2O4 (CFO) film at room temperature (300 K). We observed compressive and tensile magnetostriction switching in rotation (θ) of magnetic field in the plane of the polycrystalline CFO film. At lower angles, the film exhibits the compressive nature of magnetostriction. However, as the angle of rotation increases, the compressive behavior decays continuously and switches to tensile nature at θ = 35°, and the tensile nature continues to grow up to the angle, θ = 45°. Further rotation of the magnetic field causes the tensile nature of magnetostriction to decline and, at θ = 60°, it switches back to the compressive nature of magnetostriction. The coexistence of compressive and tensile magnetostriction in the polycrystalline CFO film makes it a potentially suitable candidate for designing both sensors and actuators, and thus the film finds a way in developing novel smart materials.