L1_0型FePt垂直磁化膜の現状と展望(<特集>「磁性薄膜作製技術II」)

概要

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L1_0-FePt perpendicular magnetized thin films are reviewed from the viewpoint of their potential use in perpendicular magnetic recording media. In order to overcome a trilemma as regards how best to achieve ultra-high recording density-by reducing media noise, by maintaining thermal stability, or by saturation-recording-a pinning-type media concept is introduced for FePt (001) films. Larger M_s and K_u, high-density pinning sites, and a smaller film thickness of the FePt (001) lead to the coexistence of a larger loop slope parameter and a smaller domain size. Layer configurations and low-temperature fct-ordering for FePt (001) media are reviewed. The mechanism for lowering the fct-ordering temperature by the high-pressure sputter-deposition method is also summarized. Microstructure tailoring and recording properties of pinning and granular-type FePt (001) media are presented, and the design and potential of these media are discussed.
2005-12-01