Energy assisted magnetic recording medium capable of suppressing high DC readback noise
View Patent ↗A perpendicular magnetic recording (PMR) disk used in energy assisted magnetic recording drives is described. The PMR disk includes a substrate, a magnetic recording layer disposed above the substrate, an exchange coupling layer disposed above the magnetic recording layer, and a capping layer disposed above the exchange coupling layer. The capping layer has a Curie temperature greater than the Curie temperature of the magnetic recording layer.
1. An energy assisted magnetic recording (EAMR) drive, comprising:
a perpendicular magnetic recording (PMR) disk comprising:
a magnetic recording layer disposed above a substrate; and
a capping layer disposed above the magnetic recording layer, wherein the capping layer has a different Curie temperature than the magnetic recording layer; and
means for reducing a DC read back noise of the EAMR drive using the capping layer, wherein the capping layer remains magnetized during a refreezing process of a write operation.
2. The EAMR drive of claim 1 , further comprising:
an energy source to generate a thermal spot on the PMR disk; and
means for reducing jitter on a trailing edge of the thermal spot using the capping layer.