Abstract: A device for spincoating an ultra-thin iron powder film on a disk for magnetic recording. Ultra-thin films are utilized on magnetic disks in view of a high density recording that may be achieved on such devices. The invention develops an iron powder particulate composition which is pre-sheared to a particular consistency within a spin chamber which is compartmented by perforated vanes, disposed on a common axis with and above the magnetic disk, and is selectively coupled to the drive shaft of the disk spinner. Magnetic means are actuable to raise the bell-type cover of the spin chamber whereby to discharge coating material onto the spinning disk. Means decouple the chamber from the drive shaft and vary the spin rate of said shaft to effect the desired thinness of coating.