Magnetic recording medium and process for its production
AssigneeAsahi Komag Co., Ltd.
InventorsMichinobu Suekane, Makoto Imakawa, Takehiko Hiruma, Kazuhiko Mitarai
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Abstract
A magnetic recording medium comprising a non-ferromagnetic substrate and a magnetic recording layer formed on the substrate with an underlayer of Cr or a Cr alloy interposed therebetween, which has a seed layer between the substrate and the underlayer, wherein said seed layer is made of a material which contains at least 30 ppm of oxygen and which has a B2 crystal structure.
Claims9
A magnetic recording medium comprising a non-ferromagnetic substrate and a magnetic recording layer formed on the substrate with an underlayer of Cr or a Cr alloy interposed therebetween, which has a seed layer between the substrate and the underlayer, wherein said seed layer is made of a material which contains at least 30 ppm of oxygen and which has a B2 crystal structure.
A process for producing a magnetic recording medium, which comprises forming a seed layer which contains at least 30 ppm of oxygen and which has a B2 crystal structure, on a non-ferromagnetic substrate by a sputtering method by means of a target which has a B2 crystal structure and which has an oxygen content of at least 100 ppm, and then forming an underlayer of Cr or a Cr alloy and a magnetic recording layer sequentially.
Dependencies are inferred from the claim text.