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AssigneesHoya Corporation, Hoya Magnetics Singapore Pte. Ltd.
InventorsHiroshi Tomiyasu, Keiji Moroishi, Teiichiro Umezawa, Kenji Ayama
Estimating the term…
In a magnetic recording medium which includes a base body (1-4), first and second magnetic layers (5 and 7), each being of a ferromagnetic material, and a spacer layer (6) formed between the first and the second magnetic layers for inducing antiferromagnetic exchange interaction between the first and the second magnetic layers, the second magnetic layer located farther from the base body than the first magnetic layer includes a primary layer (72) and a secondary layer (71) located nearer to the base body than the primary layer. The primary layer has a primary anisotropic magnetic field while the secondary layer has a secondary anisotropic magnetic field which is smaller than the primary anisotropic magnetic field. The first magnetic layer is for controlling the antiferromagnetic exchange interaction.
A magnetic recording medium comprising a base body (1-4), a first magnetic layer (5) formed on said base body, a second magnetic layer (7), and a spacer layer (6) formed between said first and said second magnetic layers, each of said first and said second magnetic layers being of a ferromagnetic material, said spacer layer being for inducing antiferromagnetic exchange interaction between said first and said second magnetic layers, said first magnetic layer being for controlling said antiferromagnetic exchange interaction, said second magnetic layer comprising a primary layer (72) and a secondary layer (71) located nearer to said base body than said primary layer, said primary layer having a primary anisotropic magnetic field, said secondary layer having a secondary anisotropic magnetic field which is smaller than said primary anisotropic magnetic field wherein said secondary layer (71) has a saturated magnetic flux density smaller than that of said primary layer (72).
Dependencies are inferred from the claim text.