This paper theoretically studied the effect of magnetic fluid lubricant on the action of the squeeze film formed when a curved upper plate with a porous facing approached an impermeable and flat lower plate by considering the rotation of the plates. Expressions were obtained for pressure, load capacity; and response time was given by a differential equation. All the three bearing characteristics increased when the curvature or the magnetization increased. The increase in pressure and load capacity depended only on the magnetization. However, the increase in response time depended on magnetization, fluid inertia and speed of rotation of the plates.