| 摘要 |
PROBLEM TO BE SOLVED: To greatly reduce medium noises by forming a magnetic recording film on a non-magnetic substrate via an undercoat layer which comprises a plurality of magnetic layers and intermediate layers between the magnetic layers, and forming the intermediate layer of a material having a B2 crystal structure or Ru. SOLUTION: As a material for an intermediate layer having a B2 crystal structure, one selected from a group of NiAl, NiAlRu, NiAlNd, NiAlCr, NiAlPt and NiAlPd is used. The intermediate layer formed of Ru is particularly preferably constructed in a hexagonal close-packed structure. As a magnetic layer, particularly, a CoCrPt alloy or CoCrTaPt alloy can be selected. For instance, when a magnetic recording film is constituted of a Co alloy magnetic layer/a B2 structure NiAlRu intermediate layer/a Co alloy magnetic layer and the Bu structure NiAlRu intermediate layer has a film thickness selected appropriately in a range of 3-30Å, especially, 3-20Å, an S/Nt is improved remarkably.
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