Patent ID: 11908500
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A magnetic recording system, comprising:
a writing head; and
a disk, including a magnetic recording medium, comprising
an essentially non-magnetic substrate;
a granular hard magnetic storage layer with perpendicular anisotropy having a coercive field of Hs without another magnetic layer and a thickness between 3 nm and 30 nm; and
a granular hard magnetic nucleation host with perpendicular anisotropy, disposed on the hard magnetic storage layer in a columnar manner, having a coercive field Hn without the hard magnetic storage layer, wherein

0.7 T<Hn<Hs;

the nucleation host has a magnetic polarization Js=μ0Ms between 0.3 T and 1.0 T;
the nucleation host and the hard magnetic storage layer are separated by a coupling layer between 0.1 nm and 3 nm thickness;
the coupling layer is directly between the nucleation host and the storage layer; and
the coupling between the nucleation host and the hard magnetic storage layer is ferromagnetic.