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AssigneeInternational Business Machines Corporation
InventorsPraveen Chaudhari, Jerome J. Cuomo, Richard J. Gambino, Thomas R. McGuire
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A beam addressable file using as a storage medium an amorphous magnetic composition having uniaxial anisotropy. The storage medium can be prepared in thin film or bulk form or as particles in a binder. The storage medium can be comprised of a single element or a multicomponent system where at least one of the components has an unpaired spin so that the composition has a net magnetic moment. The storage comosition exists in a microcrystalline structure (i.e., it has localized atomic ordering over a distance 25-100 angstroms) and also in a substantially amorphous structure (i.e., when the composition has localized atomic ordering only over distances less than 25 angstroms). Binary and ternary compositions, either alloys or compounds, are suitable. particularly good examples are combinations of rare earth elements and transition metal elements. The magnetic properties of these amorphous magnetic compositions are easily changed during fabrication or after fabrication, and the compositions can be doped readily without adversely affecting magnetic properties. Either electron beams or light beams can be used to write information into the storage medium and optical readout is generally preferred. Curie point writing or compensation point writing is used.
A magnetic system, comprising;
A beam addressable system, comprising:
A magnetic storage system, comprising:
In a storage system comprising a storage medium onto which is incident an electromagnetic beam used to write a plurality of bits of information into the storage medium or to read the information associated with the bits stored in the storage film, the improvement being a magnetic storage medium exhibiting no long range atomic ordering and which exhibits long range magnetic ordering where said storage medium has a perpendicular uniaxial magnetic anisotropy which is not due to crystalline structure and long range atomic ordering.
In a storage system including a storage medium onto which is incident an electromagentic beam used to either write a plurality of bits of information into said storage medium or to read the information state of said bits of information in said storage medium, the improvement being a storage medium characterized by an amorphous atomic structure where said storage medium has long range magnetic ordering and a growth induced uniaxial anisotropy due to pair ordering in the storage medium.
In a storage system including a storage medium onto which is incident an electromagnetic beam that is used to either write a plurality of bits of information into said storage medium or to read the information state of said bits in said storage medium, the improvement being a magnetic storage medium having an amorphous atomic structure and long range magnetic ordering, said amorphous magnetic medium having a shape-induced perpendicular uniaxial magnetic anisotropy which is not due to crystalline structure and long range atomic ordering.
Dependencies are inferred from the claim text.