Patent ID: 9601144
Date: 2017-03-21
CPC Classifications: G11B

Claim:
1. A heat-assisted magnetic recording (HAMR) disk drive comprising: a rotatable magnetic recording disk comprising a substrate, a first continuous non-patterned magnetic layer on the substrate comprising a substantially chemically-ordered alloy comprising Pt and one of Fe and Co and having a Curie temperature (T a laser light source capable of supplying at least two levels of laser output power; an optical channel and near-field transducer for directing radiation from the light source to the disk to heat regions of the first and second magnetic layers; a write head for applying a magnetic write field to write data bits in the heated regions of the first and second magnetic layers; a read head for generating a composite readback signal from the written data bits in the first and second magnetic layers; a carrier for supporting the write head, near-field transducer and read head; and a data detector coupled to the read head for generating from the composite readback signal independent data streams representing the written data bits in the first and second magnetic layers.