Vertical magnetic recording medium, method for producing the same and magnetic recorder

摘要

A vertical magnetic recording medium exhibiting excellent noise characteristics in which magnetic interaction is reduced in a magnetic layer. The vertical magnetic recording medium ( 10 ) includes a nonmagnetic substrate ( 1 ), an underlying layer ( 2 ) formed directly or indirectly on the nonmagnetic substrate ( 1 ), and a magnetic layer ( 4 ) for recording magnetic information formed on the underlying layer ( 2 ), characterized in that the underlying layer ( 2 ) is composed of an alloy principally including two kinds of element, difference of standard free energy DeltaG° for producing an oxide or a nitride of the both elements at room temperature is set not lower than 70 kJ/mol[O2 or N2], and crystal grains constituting the underlying layer ( 2 ) principally includes one of two elements having a higher DeltaG°, and the grain boundary of the underlying layer ( 2 ) principally includes an oxide or a nitride of an element having a lower DeltaG°.