Magnetic recording medium, process for fabricating magnetic recording medium and information regenerator

A process for fabricating magnetic recording medium comprising a non-magnetic substrate and a recording layer formed thereon wherein said recording layer comprises at least one non-ferromagnetic material selected from the group consisting of non-magnetic materials and antiferromagnetic materials and a plurality of ferromagnetic crystal grains solid-insoluble with said at least one non-ferromagnetic material which are dispersed in the non-ferromagnetic material, wherein

• said process comprising the step of depositing the recording layer on the substrate while changing the composition ratio of the ferromagnetic material to non-ferromagnetic material.

A process for fabricating magnetic recording medium wherein a RF bias is applied to said substrate during the formation of said recording layer.

An information regenerator comprising a magnetic recording medium on which information is recorded by magnetization and a magnetic head which is located in the vicinity of or in contact with said magnetic recording medium to detect magnetization at each point on said magnetic recording medium for regenerating said magnetization detected by said magnetic head, wherein:

• said magnetic recording medium comprises a non-magnetic substrate and a recording layer formed thereon, said recording layer being composed of at least one non-ferromagnetic material selected from the group consisting of non-magnetic materials and antiferromagnetic materials and a plurality of crystal grains of ferromagnetic material solid-insoluble with said non-ferromagnetic material which are dispersed in said at least one non-ferromagnetic material;
• and
• said recording layer has at least two phases, along the depth direction, with each phase having a different mean composition ratio of the ferromagnetic material to the non-ferromagnetic material from that or those of the adjacent phase or phases.