| 摘要 |
PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium and magnetic storage device permitting high recording density while securing excellent recording ease and improving thermal stability of remnant magnetization. SOLUTION: A perpendicular magnetic recording medium comprises a substrate 11 and, a soft magnetic backing laminate 12, a separation layer 16, an underlayer 18, an intermediate layer 19, a recording layer 21, a protection film 28, and a lubricant layer 29 which are successively laminated on the substrate 11. The recording layer 21 comprises a first magnetic layer 22, a second magnetic layer 23, a non-magnetic coupling layer 24, and a third magnetic layer 25 which are laminated in this order from the intermediate layer side 19. The first to third magnetic layers each comprise ferromagnetic materials comprising Co alloy of hcp crystal structures, and an axis of easy magnetization is oriented in an almost vertical direction to a substrate surface. Moreover, the medium has a ferromagnetic exchange-coupling structure where the second magnetic layer 23 and the third magnetic layer 25 are ferromagnetically exchange-coupled via the non-magnetic coupling layer 24. COPYRIGHT: (C)2008,JPO&INPIT
|
