Magnetic recording medium, method for its production, and system for its use

A method for producing a thin-film magnetic recording medium, comprising the steps of:

• providing a substrate;
• providing an underlayer on said substrate;
• providing a first magnetic layer on said underlayer;
• providing a first nonmagnetic intermediate layer on said first magnetic layer;
• and
• providing a second magnetic layer on said first nonmagnetic intermediate layer;
• wherein the residual magnetic flux density B.sub.r and thickness .delta. are each different for each magnetic layer;
• and
• wherein the magnetic layer-providing steps are performed so that the product B.sub.r .multidot..delta. is the same for each magnetic layer.

In a recording/reproduction system including a magnetic recording medium drive unit, a magnetic head, a magnetic head drive unit, a thin-film magnetic recording medium, and a read/write signal processing system for processing signals read to and written from the magnetic recording medium, the improvement wherein said thin-film magnetic recording medium comprises:

• a substrate;
• an underlayer on said substrate;
• a first magnetic layer on said underlayer;
• a first nonmagnetic intermediate layer on said first magnetic layer;
• and
• a second magnetic layer on said first nonmagnetic intermediate layer;
• wherein the residual magnetic flux density B.sub.r and thickness .delta. are each different for each magnetic layer, and the dot product B.sub.r .multidot..delta. is the same for each magnetic layer.