A method for making a composite substrate circulator comprising disposing a plurality of sleeves about a plurality of rods, disposing the plurality of rods and the plurality of sleeves in a plurality of openings in a block to form an assembly, and dividing the assembly to form a plurality of plates. Each plate includes a portion of the plurality of sleeves and the plurality of rods. The magnetic saturation (4PiMs) values of the rods and sleeves are chosen to decrease radially (rod has the highest 4PiMs).