Bit patterned magnetic media
AssigneeSeagate Technology LLC
InventorsErol Girt, Hans J. Richter, Alexander Y. Dobin
Life of this patent
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Abstract
A bit patterned magnetic recording medium, comprises a non-magnetic substrate having a surface; a plurality of spaced apart magnetic elements on the surface, each of the elements constituting a discrete magnetic domain or bit; and a layer of a ferromagnetic material for regulating magnetic exchange coupling between said magnetic elements. The layer has a saturation magnetization Ms ranging from about 1 to about 2,000 emu/cm3, preferably below about 400 emu/cm3, more preferably below about 200 emu/cm3, and may overlie, underlie, or at least partially fill spaces between adjacent magnetic elements.
Claims37
An apparatus, comprising:
- (a) a plurality of spaced apart magnetic elements, each of said elements constituting a discrete magnetic domain or bit;
- and
- (b) a matrix of ferromagnetic material partially filling spaces between said magnetic elements, the matrix of ferromagnetic material comprising a property that facilitates regulation of magnetic exchange coupling between the magnetic elements.
An apparatus, comprising:
- a substrate having a surface;
- a plurality of spaced apart magnetic elements on the surface, each of the magnetic elements constituting a discrete magnetic domain or bit;
- and
- at least one of a matrix of a ferromagnetic material disposed between adjacent magnetic elements of the plurality of spaced apart magnetic elements and a layer of a ferromagnetic material disposed above the magnetic elements, the at least one of the matrix of the ferromagnetic material and the layer of the ferromagnetic material comprising a property that facilitates regulation of magnetic exchange coupling between the magnetic elements.
A method of fabricating a bit patterned magnetic recording medium, comprising:
- forming a plurality of spaced apart magnetic elements on a surface of a substrate, each of the magnetic elements constituting a discrete magnetic domain or bit;
- and
- forming at least one of a matrix of a ferromagnetic material between adjacent magnetic elements of the plurality of spaced apart magnetic elements and a layer of a ferromagnetic material above the magnetic elements, the at least one of the matrix of the ferromagnetic material and the layer of the ferromagnetic material comprising a property that facilitates regulation of magnetic exchange coupling between the magnetic elements.
A bit patterned magnetic recording medium, comprising:
- a substrate having a surface;
- a plurality of spaced apart magnetic elements on the surface, each of the magnetic elements constituting a discrete magnetic domain or bit;
- and
- at least one of a matrix of a ferromagnetic material disposed between the magnetic elements and a layer of a ferromagnetic material disposed above the magnetic elements, the at least one of the matrix of the ferromagnetic material and the layer of the ferromagnetic material comprising a property that facilitates control of a coercivity field (HC) distribution resulting from magnetostatic interaction between the magnetic elements.
Dependencies are inferred from the claim text.