Low NLTS media: perpendicular / longitudinal composite media

Summary form only given. The reduction of nonlinearity of recording process, such as NLTS, is very important issue to incrcase the density of magnetic recording. Although the write compensation reduces the effects from NLTS, it is desirable to employ the recording system with small nonlinearity. A perpendicular I longitudinal (PIL) composite medium, consisting of perpendicular recording top layer and longitudinal recording underlayer, performs excellent readlwrite characteristics and is applicable to the conventional recording system ['I. The essential of the opposite direction of non-linear transition shifts at perpendicular and longitudinal recording layers, makes the P L composite media tend to have very low NLTS. Experimental results of this work show that PR composite media has much lower NLTS value than the pure perpendicular media, and it is also preferable to he used as a low NLTS medium.