MAGNETIC RECORDING MEDIUM, METHOD FOR PRODUCING THEREOF, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS

摘要

A MAGNETIC RECORDING MEDIUM WHICH IS PROVIDED ON A NONMAGNETIC SUBSTRATE 1 WITH AT LEAST AN ORIENTATION-CONTROLLING LAYER 3 FOR CONTROLLING THE ORIENTATION OF A LAYER FORMED DIRECTLY THEREON, A PERPENDICULARLY MAGNETIC LAYER 4 HAVING AN EASILY MAGNETIZING AXIS ORIENTED MAINLY PERPENDICULARLY RELATIVE TO THE NONMAGNETIC SUBSTRATE 1, AND A PROTECTIVE LAYER 5 AND CHARACTERIZED IN THAT THE PERPENDICULARLY MAGNETIC LAYER 4 INCLUDES TWO OR MORE MAGNETIC LAYERS, THAT AT LEAST ONE OF THE MAGNETIC LAYERS IS A LAYER 4a HAVING Co AS A MAIN COMPONENT AND CONTAINING Pt AS WELL AND CONTAINING AN OXIDE AND THAT AT LEAST ANOTHER OF THE MAGNETIC LAYERS IS A LAYER 4b HAVING Co AS A MAIN COMPONENT AND CONTAINING Cr AS WELL AND CONTAINING NO OXIDE.