Magnetic thin film magnetic recording medium
AssigneeHitachi, Ltd.
InventorsKazusuke Yamanaka, Tomoo Yamamoto, Yuzuru Hosoe, Nobuyuki Inaba, Yasutaro Uesaka, Masaaki Futamoto, Yoshibumi Matsuda, Kenji Furusawa, Shinji Narishige
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Abstract
A ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N is high. The ferromagnetic thin film as the magnetic film of the magnetic recording medium is such that the fluctuation field of magnetic viscosity at 25° C. at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds and the coercivity is not less than 2000 oersteds.
Claims17
A magnetic recording medium using a ferromagnetic thin film as a magnetic layer whose fluctuation field of magnetic viscosity at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds.
A magnetic recording medium using a ferromagnetic thin film as a magnetic layer whose fluctuation field of magnetic viscosity at the field strength equal to remanence coercivity or coercivity is not less than 20 oersteds.
A magnetic recording medium using a ferromagnetic thin film as a magnetic layer whose fluctuation field of magnetic viscosity at the field strength equal to remanence coercivity or coercivity is not less than 30 oersteds.
Dependencies are inferred from the claim text.