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
Estimating the term…
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.
Claims22
A heat-assisted magnetic recording (HAMR) device comprising:
- a recording head with a heat 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, the first recording layer having a lower Curie temperature than the 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 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.
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, the adjacent data bits having opposite polarity;
- and
- controlling the write element to create a region of neutral polarity at a boundary between the adjacent data bits on the first pass over the data track.
One or more non-transitory computer-readable storage media encoding processor-executable instructions for writing data to a magnetic storage media, the processor-executable instructions being executable to:
- control 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, the adjacent data bits having opposite polarity;
- and
- control the write element to create a region of neutral polarity at a boundary between the adjacent data bits on the first pass over the data track.
Dependencies are inferred from the claim text.