Magnetic recording media and magnetic recording read-back system which uses such media

A magnetic recording read-back system having a magnetic recording media, a magnetic head which reads back a recording stored on said media, a driver system which causes relative motion between said media and said magnetic head, and an actuator which determines a position on said magnetic recording media over which the magnetic head should be located, wherein the media comprises:

• a non-magnetic substrate;
• a magnetic film having at least two magnetic layers separated by a non-magnetic intermediate layer so as to form a stacked set of layers, each of the at least two magnetic layers having a lattice constant, the lattice constants being different from one another;
• and;
• a structure control underlayer situated between the non-magnetic substrate and the magnetic film,
• wherein at least one of the at least two magnetic layers includes at least two magnetic films, of different lattice constants, which have been epitaxially grown so as to interface each other.