A magnetic writer includes a write element and an oscillation device
disposed adjacent to the write element. The first oscillation device
includes a first magnetic layer, a second magnetic layer having a
magnetization vector including a component perpendicular to a major plane
of the first magnetic layer. The first nonmagnetic layer disposed between
the first magnetic layer and the second magnetic layer. The first
oscillation device generates a high-frequency oscillation field when a
current is directed perpendicular to the major plane of the first
magnetic layer.