Patent ID: 8611142

Claim:
A magnetic recording device comprising: a magnetic recording section and a magnetization oscillator; and a first nonmagnetic layer disposed between the magnetic recording section and the magnetization oscillator, the magnetic recording section including: a first ferromagnetic layer with a magnetization substantially fixed in a first direction; a second ferromagnetic layer with a variable magnetization direction; and a second nonmagnetic layer disposed between the first ferromagnetic layer and the second ferromagnetic layer, the magnetization oscillator including a third ferromagnetic layer with a variable magnetization direction; a fourth ferromagnetic layer with a magnetization substantially fixed in a second direction; and a third nonmagnetic layer disposed between the third ferromagnetic layer and the fourth ferromagnetic layer, at least one of the first and second direction being generally perpendicular to the film plane of the layers of the magnetic recording section and the magnetization oscillator, and the magnetization direction of the second ferromagnetic layer being generally parallel or antiparallel to the first direction and being determinable in response to the orientation of a current, by passing the current in a direction generally perpendicular to the film plane, and the magnetization of the third ferromagnetic layer being able to undergo precession by passing the current.