Vertically and horizontally weakly coupled perpendicular small grain media

摘要

In one general embodiment, a magnetic medium includes a recording layer having at least three exchange control layers each having a magnetic moment less than 100 emu/cc, and four magnetic layers separated from one another by the exchange control layers. An uppermost of the magnetic layers is doped with oxygen. In another general embodiment, a magnetic medium includes a recording layer having at least three exchange control layers and four magnetic layers separated from one another by the exchange control layers. An uppermost of the magnetic layers has an oxygen content of greater than 0.5 vol %. An average pitch of magnetic grains in a lowermost of the magnetic layers is 9 nm or less. A lowermost of the magnetic layers has an oxide content of at least 20 vol %.

主权项

1. A magnetic medium, comprising:
a recording layer comprising at least three exchange control layers each having a magnetic moment less than 100 emu/cc, and four magnetic layers separated from one another by the exchange control layers, wherein an uppermost of the magnetic layers is doped with oxygen, wherein a magnetic cluster size of the recording layer is less than about 30 nm, wherein at least one of the exchange control layers comprises Co, Cr, Ru and oxygen.