| 摘要 |
PURPOSE:To contrive to improve both the line recording density and the track density by using a material having a larger saturated magnization and a lower permeability toward the 2nd magnetic film remote from a nonmagnetic layer more than the 1st magnetic film and making the width wider. CONSTITUTION:Since the magnetic field strength generated by a coil layer 15 at write is very large, the write magnetic field at write is decided by the saturated magnetization MS2 of magnetic layers 22, 32 according to the magnetization curve C2. Since the magnetic field is nearly 1/3 of the write magnetic field, only magnetic layers 21, 31 at the inner side having a large permeability are effective. Thus, the recording density characteristic at read depends on the length (g) of the recording/reproducing gap 16, the thickness pt1 of the magnetic layer 31 and the thickness pb1 of the magnetic layer 21. The write magnetic field Hs depends on the size g+pt+pb, but since the recording density D50 depends on the size g+pt1+pb1, both the magnetic field Hw and the recording density D50 are increased. Thus, the high line recording density is attained. |
