Abstract
In this paper, we present a method for correcting transition curvature in heat assisted magnetic recording. By appropriately varying the recording head field across the track width, straight transitions free of curvature can be created even with a circular thermal profile. Micromagnetic modeling study has been performed to show the consequent signal-to-noise ratio enhancement and corresponding area density gain. Effect of less-than-optimum head field has been analyzed.
Highlights
In heat assisted magnetic recording (HAMR), temperature contour of the thermal profile inside the medium plane, generated by a near-field-transducer, often is either elliptical or circular
With the magnetic recording field, produced by today’s relatively large size write head, virtually being spatially uniform, the resulting transition fronts basically follow the temperature contour of the thermal profile at which magnetization freezes. This is why transitions are curved across the track width in HAMR
It has been reported that HAMR transition curvatures are significantly worse than that produced by current perpendicular magnetic recording (PMR).[1,2,3,4,5,6,7]
Summary
In heat assisted magnetic recording (HAMR), temperature contour of the thermal profile inside the medium plane, generated by a near-field-transducer, often is either elliptical or circular. With the magnetic recording field, produced by today’s relatively large size write head, virtually being spatially uniform, the resulting transition fronts basically follow the temperature contour of the thermal profile at which magnetization freezes. This is why transitions are curved across the track width in HAMR. We propose a methodology for obtaining a cross-track varying head field distribution for writing curvature-free transitions with circular thermal profile. Analysis of recording performance impact by correcting transition curvature will be presented
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