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US 10,950,268 B1Granted
Radially patterned media for circumferentially constrained grain growth
AssigneeSeagate Technology LLC
InventorsThomas Y. Chang, Philip L. Steiner, Xiaomin Yang, Bin Lu
Life of this patent
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Abstract
A method of forming a patterned media includes constraining growth of magnetic grains in a down-track direction without constraining the growth in a radial direction to cause the magnetic grains to align in rows extending in the radial direction. The patterned media may allow for data track radial width to be defined independent of grain size.
Claims18
A method of forming a bit patterned media comprising:
- constraining growth of magnetic grains in a down-track direction of the patterned media without constraining growth of the magnetic grains in a radial direction of the patterned media to cause the magnetic grains to substantially align in rows extending to form an arched pattern in the radial direction, each one of the magnetic grains being magnetically isolated from one another by non-magnetic material within each individual one of the radial-direction rows.
A system comprising:
- a patterned media including magnetic grains being substantially aligned in rows extending in a radial direction, each one of the magnetic grains being magnetically isolated from one another by non-magnetic material within each individual one of the radial-direction rows, the magnetic grains lacking substantial alignment in a recording direction;
- and
- a read/write controller configured to control a write head to write an individual data bit on the patterned media by transitioning a group of the magnetic grains to a same magnetic polarity, the group of magnetic grains having a radial width defined independent of the patterned media that is based on a dimension of the write head.
A system comprising:
- a patterned media including magnetic grains being substantially aligned in rows extending in a radial direction, the magnetic grains within each of the radial-direction rows being magnetically isolated from one another by non-magnetic material;
- a read/write controller configured to control a write head to write an individual data bit on the patterned media by transitioning a group of the magnetic grains, the group of magnetic grains having a radial width defined based on a dimension of the write head, the radial width of the group of grains being independent of grain size on the patterned media.
Dependencies are inferred from the claim text.