Write transducer having a magnetic buffer layer spaced between a side shield and a write pole by non-magnetic layers

摘要

A write transducer for a disk drive magnetic head includes a ferromagnetic write yoke having a write pole protruding towards an air bearing surface. The write transducer also includes a ferromagnetic side shield, and a ferromagnetic buffer layer disposed between the write yoke and the side shield. A first non-magnetic layer is disposed between the side shield and the ferromagnetic buffer layer. A second non-magnetic layer is disposed between the ferromagnetic buffer layer and the write yoke. The ferromagnetic buffer layer extends in a direction normal to the air bearing surface by a buffer layer throat height in the range of 10 nm to 500 nm. In certain embodiments, such a write transducer may advantageously reduce undesired wide area track erasure, without unacceptably degrading write field rise time for acceptable on-track writing data rate.

主权项

1. A write transducer comprising:
a write yoke comprising a first ferromagnetic material and including a write pole protruding from the write yoke towards an air bearing surface of the write transducer; a side shield comprising a second ferromagnetic material; a ferromagnetic buffer layer disposed between the write yoke and the side shield, the ferromagnetic buffer layer comprising a third ferromagnetic material; a first non-magnetic layer disposed between the side shield and the ferromagnetic buffer layer, the ferromagnetic buffer layer being spaced from the side shield by no less than a thickness of the first non-magnetic layer; and a second non-magnetic layer disposed between the ferromagnetic buffer layer and the write yoke, the ferromagnetic buffer layer being spaced from the write yoke by no less than a thickness of the second non-magnetic layer; wherein the ferromagnetic buffer layer extends in a direction normal to the air bearing surface by a buffer layer throat height in the range of 10 nm to 500 nm, and wherein the third ferromagnetic material has a magnetic moment that is 0.6 to two times that of the second ferromagnetic material.