Hitachi, Ltd.

Western Digital Technologies, Inc.

Hgst Netherlands, B.v.

Junichi Sayama

Ikuko Takekuma

Akemi Hirotsune

Yoshiyuki Hirayama

Hiroaki Nemoto

Kimio Nakamura

A magnetic recording medium includes an amorphous buffer layer, a hybrid layer including a barrier layer, and a texture control layer. The magnetic recording medium also includes a heat sink layer, an under layer, and a perpendicular recording layer.

Perpendicular magnetic recording medium

According to one embodiment, a magnetic medium includes a substrate, and a magnetic recording layer positioned above the substrate, the magnetic recording layer including an ordered alloy having a L1-type structure, where the ordered alloy comprises a plurality of ferromagnetic crystal grains surrounded by non-magnetic grain boundaries, and where the ordered alloy comprises Fe, Ni and Pt.

[object Object]

Surface flatness of magnetic recording medium to which a magnetic recording layer made of L1FePt magnetic alloy thin film, with distance between a magnetic head and a magnetic recording medium sufficiently reduced. The magnetic recording layer includes: magnetic layers containing a magnetic alloy including Fe and Pt as principal materials; and one non-magnetic material selected from carbon, oxide and nitride. The first magnetic layer disposed closer to a substrate has a granular structure in which magnetic alloy grains including FePt alloy as the principal material are separated from grain boundaries including the non-magnetic material as the principal material. The second magnetic layer disposed closer to the surface than the first magnetic layer is fabricated so as to have a homogeneous structure in which an FePt alloy and the non-magnetic material are mixed in a state finer than diameters of the FePt magnetic alloy grains in the first magnetic layer.

Magnetic recording medium including plural FePt alloy layers including carbon, oxides or nitrides

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Fujisawa, Japan

Junichi Sayama