Patent ID: 7232620
Filing Date: 2007-06-19
Classification: B82Y,G11B,Y10S,Y10T

Abstract:
1. A magnetic storage apparatus comprising: at least one magnetic recording medium; and at least one head adapted to apply a magnetic field to the magnetic recording medium; said magnetic recording medium including: a first magnetic layer; a second magnetic layer; and a non-magnetic coupling layer provided between said first magnetic layer and said second magnetic layer so that said first and second magnetic layers are exchange coupled; wherein, during a recording process, the magnetic field applied to the recording medium is limited to a range such that magnetizations of said first magnetic layer and said second magnetic layer are maintained in either a first antiparallel state or a second antiparallel state, without entering into a parallel state, whereby in said second antiparallel state the magnetizations of said first magnetic layer and said second magnetic layer are reversed, but still antiparallel, relative to the magnetizations in said first antiparallel state; and wherein said first magnetic layer has an exchange coupling field Hex