Media design and write technique for creating neutral polarity transition zones
AssigneeSeagate Technology LLC
InventorsThomas Young Chang, Philip L. Steiner, Zengyuan Liu
Life of this patent
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Abstract
A heat-assisted magnetic recording (HAMR) device is configured to write regions of neutral polarity on a magnetic media during a same pass of the recording head in which other regions are written of positive polarity and negative polarity. The various disclosed write techniques may facilitate creation of “zero state” (substantially net zero polarity) transition zones between each pair of data bits of opposite polarity and/or may facilitate the encoding of three different logical states (e.g., 1, 0, and −1) on the media.
Claims20
A magnetic media comprising:
- a first recording layer and a second recording layer, each layer comprising a plurality of magnetic grains forming data bits, with the first recording layer having a lower Curie temperature than the second recording layer;
- an insertion layer comprising magnetic material between the first recording layer and the second recording layer;
- and
- a region of neutral polarity present across the first recording layer, the second recording layer and the insertion layer and between a pair of adjacent data bits.
A magnetic media comprising:
- a first recording layer and a second recording layer, each layer comprising a plurality of magnetic grains forming data bits, with the first recording layer having a lower Curie temperature than the second recording layer;
- a break layer between the first recording layer and the second recording layer decoupling the first recording layer from the second recording layer;
- and
- a region of neutral polarity present across the first recording layer, the second recording layer and the break layer and between a pair of adjacent data bits.
A heat-assisted magnetic recording (HAMR) device comprising:
- a recording head with a heating element that heats a magnetic media according to a thermal profile that moves along a data track during a write process;
- a magnetic media including a first recording layer and a second recording layer, each layer comprising a plurality of magnetic grains forming data bits, with the first recording layer having a lower Curie temperature than the second recording layer, an insertion layer comprising magnetic material between the first recording layer and the second recording layer, and a region of neutral polarity between a pair of adjacent data bits;
- and
- a controller that controls a magnetic write field of a recording head to create the region of neutral polarity on a single pass of the recording head by altering a polarity of magnetic grains in the first recording layer after fixing a polarity of corresponding magnetic grains in the second recording layer.
Dependencies are inferred from the claim text.