Abstract
Write spacing losses in perpendicular magnetic recording have been investigated experimentally for a ring head and a single pole head. In ring head recording, an increase of write spacing causes the change of magnetization mode in the Co-Cr layer from perpendicular to longitudinal. In single pole head recording, the magnetization mode remains perpendicular, even for large write spacing. Furthermore, the reproduced voltage in saturation recording decreases with increased write spacing, since the magnetization transition length is broadened by the decreasing write head field gradient resulting from disappearance of head-to-medium magnetic coupling. Therefore, in perpendicular magnetic recording, a slight reduction of the head-to-medium spacing leads to a remarkable improvement in high density recording characteristics.
