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US 8,411,392 B2Granted
Magnetic field sensor including multiple magnetoresistive sensing elements for patterned media
AssigneeSeagate Technology LLC
InventorsRene J. M. van de Veerdonk, Thomas F. Ambrose
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Abstract
An apparatus for sensing magnetic domains in a patterned media that includes a first sensing element and a second sensing element in electrical communication with the first sensing element. The first sensing element has an output voltage lead and the second sensing element has an output voltage lead. The patterned media may be a bit patterned media or a track patterned media.
Claims21
An apparatus, comprising:
- a first sensing element aligned with a second sensing element proximal a plurality of discrete magnetic bits of a bit patterned media, said first and second sensing elements each comprising a ferromagnetic material, said first and second sensing elements configured to be self-referencing by generating a voltage difference between at least two voltage leads.
A data storage system, comprising:
- a bit patterned media having a plurality of magnetic domains;
- and
- multiple sensing elements positioned proximate to at least one of the magnetic domains, each of said multiple sensing elements comprising a ferromagnetic material and configured to be self-referencing by generating a voltage difference between at least two voltage leads.
A data storage system, comprising:
- a track patterned media having a plurality of data tracks;
- a linear array of a plurality of sensing elements each positioned proximate to said plurality of data tracks and configured to sense a magnetic domain from an adjacent storage media based on the extraordinary Hall effect;
- each of said multiple sensing elements comprising a ferromagnetic material and configured to be self-referencing by generating a voltage difference between at least two voltage leads.
A data storage system, comprising:
- a bit patterned media having a plurality of spaced apart magnetic elements comprising a discrete magnetic domain;
- and
- a linear array of a plurality of sensing elements separated by distances corresponding to distances between first, second and third magnetic elements, each magnetic element comprising ferromagnetic material and configured to be self-referencing by generating a voltage difference between at least two voltage leads.
Dependencies are inferred from the claim text.