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.
Claims17
A method comprising:
- controlling a write element on a HAMR device to write data to adjacent data bits on a magnetic storage media on a first pass over a data track;
- and
- controlling the write element to create a region of neutral polarity at a boundary between the adjacent data bits, the region of neutral polarity having a size that is less than a width of a data bit.
A magnetic media comprising:
- a first recording layer and a second recording layer;
- multiple pairs of adjacent data bits having opposite polarity;
- and
- a region of neutral polarity between each pair of adjacent data bits, the region of neutral polarity having a size that is less than a width of the adjacent data bits.
A heat-assisted magnetic recording (HAMR) device comprising:
- a recording head with a heat element that moves along a data track during a write process;
- a magnetic media including a first recording layer and a second recording layer;
- and
- a controller that controls a magnetic write field of a recording head to create a region of neutral polarity at a boundary between each pair of adjacent data bits having opposite polarity, the region of neutral polarity having a size less than a width of a data bit and the region of neutral polarity being created 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.