Magnetic recording write head with spin-torque oscillator (STO) and extended seed layer

摘要

A magnetic recording write head includes a spin torque oscillator (STO) between a seed layer disposed on a write pole and trailing shield. The seed layer has a cross-track width greater than the width of the STO and a depth in a direction orthogonal to the disk-facing surface of the write pole greater than the depth of the STO. A first insulating refill layer is formed on the sides of the seed layer and STO, and a second insulating refill layer in contact with the first refill layer has a thermal conductivity greater than that of the first refill layer. When current is passing through the STO, the seed layer spreads the current to reduce heating of the write pole and STO, and the bilayer refill material facilitates the transfer of heat away from the write pole and STO.