Microwave assisted magnetic recording (MAMR) write head and system

摘要

A microwave-assisted magnetic recording (MAMR) write head includes a yoke structure with a main pole, a flux return pole, and a trailing magnetic shield. The main pole includes a write pole with a tip at the disk-facing surface, a sub pole with an end recessed from the disk-facing surface and an electrically insulating layer between the write pole and the sub pole. The spin-torque oscillator (STO) is located at the disk-facing surface between the trailing shield and the write pole tip. The insulating layer assures that the STO current is not shorted between the return pole and the write pole. The insulating layer between the write pole and the sub pole increases the area of the junction between the return pole and write pole, which reduces the magnetic reluctance of the yoke structure.

主权项

1. A microwave-assisted magnetic recording (MAMR) write head for magnetizing regions in a magnetic recording layer, the write head comprising:
a head carrier having a generally planar first surface and a surface for facing the recording layer that is generally orthogonal to said first surface; a main pole on the first surface comprising a write pole having a tip substantially at the recording-layer-facing surface, a sub pole and an electrically insulating layer between the write pole and the sub pole; a return pole having an end substantially at the recording-layer-facing surface; a yoke stud of magnetically permeable material connecting and magnetically coupling the return pole to the sub pole, the yoke stud being in direct contact with the sub pole, wherein there is no insulating material between the yoke stud and the sub pole; an electrically conductive pancake coil between the main pole and the return pole, the pancake coil having sections wherein all of said sections lie in substantially the same plane and are wrapped around the yoke stud; a trailing shield substantially at the recording-layer-facing surface and magnetically coupled to the return pole; and a spin torque oscillator (STO) substantially at the recording-layer-facing surface between the trailing shield and the write pole tip; wherein the return pole, trailing shield and write pole provide an electrically conductive path for electrical current to the STO.