Electric field applying magnetic recording method and magnetic recording system

A magnetic recording system, comprising:

• a magnetic recording medium including a substrate, a first ferromagnetic layer formed on said substrate, a nonmagnetic layer formed on said first ferromagnetic layer, and a second ferromagnetic layer formed on said nonmagnetic layer;
• a magnetic pole for applying a magnetic field H to invert a magnetizing direction of said first ferromagnetic layer;
• and
• an electrode for applying a positive or negative voltage V between a metallic probe and said magnetic recording medium, wherein a coercivity Hc2 of said second ferromagnetic layer is larger than that Hc1 of said first ferromagnetic layer;
• wherein said magnetic field H changes said magnetizing direction of said first ferromagnetic layer to a direction of an applied magnetic field;
• and
• wherein applying said positive or negative voltage V inverts said magnetizing direction of said second ferromagnetic layer, thereby recording magnetization information in said second ferromagnetic layer.

An electric field applying magnetic recording method comprising the steps of:

• applying a magnetic field H from a magnetic pole to a magnetic recording medium composed of a substrate, a first ferromagnetic layer formed on said substrate, a nonmagnetic layer formed on said first ferromagnetic layer, and a second ferromagnetic layer of which coercivity Hc2 is larger than that Hc1 of said first ferromagnetic layer, formed on said nonmagnetic layer, thereby changing a magnetizing direction of said first ferromagnetic layer to a direction of said applied magnetic field;
• applying a positive or negative voltage V between a metallic probe and said magnetic recording medium to change an energy of a quantum well level between said first and second ferromagnetic layers, thereby inducing an exchange magnetic field HE;
• and
• changing a magnetizing direction of said second ferromagnetic layer to a direction of said applied magnetic field with both said exchange magnetic field HE and said magnetic field H.