A method for independently forming neck height and pole width dimensions in a main pole layer of a PMR write head is described. Rather than subjecting an entire image to computationally intensive face detection analysis, the image is subjected to computationally simply analysis to identify candidate pixels likely to be of skin colour. The pinions of the one array engage the teeth of one angle on the sun and ring gears and the pinions of the other array engage the teeth of the other angle on the sun and ring gears. More preferably, heat radiating effect is given to a fourth passivation film 50 to make the EL element 203 to be enclosed by heat radiating layers.