Patent ID: 8482968

Claim:
An apparatus for creating a magnetic field, the apparatus comprising: a writer including a first magnetic write layer and a second magnetic write layer; wherein the writer, when energized by a first write voltage, is configured to switch a magnetic anisotropy of the first magnetic write layer from parallel to a plane of the first magnetic write layer to orthogonal to the plane of the first magnetic write layer such that the second magnetic write layer induces a first magnetic field in a region proximate the writer; and wherein the writer, when energized by a second write voltage, is configured to switch a magnetic anisotropy of the second magnetic write layer from parallel to a plane of the second magnetic write layer to orthogonal to the plane of the second magnetic write layer such that the first magnetic write layer induces a second magnetic field in the region proximate the writer, the second magnetic field being in a direction opposite the first magnetic field.