Method for providing transverse magnetic bias proximate to a pole tip to speed up the switching time of the pole-tip during the writing operation
View Patent ↗A method for providing transverse magnetic bias proximate to a pole tip to speed up the switching time of the pole-tip during the writing operation is disclosed. The transverse field disposed proximate the pole-tip helps the conventional driving field in rotating the magnetization through the first 90-degrees, especially at small angle where the effective anisotropy-field is strongest in opposing the conventional driving field. By offsetting the magnetization from its easy-axis, the transverse field also increases the torque that the collinear driving field would have on the magnetization.
1. A method for providing assistance in magnetization switching to a pole tip, comprising:
disposing a magnetic bias field source proximate to and along side the pole tip for switching the pole-tip magnetization; and
causing current to flow through the magnetic bias field source to provide a magnetic bias-field to the pole tip to bias the magnetization of the pole-tip transversely.
2. The method of claim 1 wherein the providing the magnetic bias-field to a pole tip further comprises providing the magnetic bias field substantially transverse to the longitudinal axis of the pole tip and along side the pole tip.
3. The method of claim 1 wherein the causing current to flow through the magnetic bias field source to provide a magnetic bias-field to a pole tip further comprises providing the magnetic bias field substantially transverse to an easy axis of magnetization of the pole tip.