Processing sheme for domain expansion rom media
First Claim
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1. A method of processing a domain expansion storage medium in which a magnetic wall is displaced in a readout layer to thereby enlarge a magnetic domain of a storage layer so as to reproduce an information indicated by said magnetic domain, said method comprising the steps of:
- a) depositing said storage layer above a substrate of said storage medium;
b) passing at least one beam of ions through a mask with a predetermined pattern so as to project said predetermined pattern towards said storage layer; and
c) controlling said ion beam so as to alter the magnetic properties of said storage layer at regions below exposed portions in order to define magnetic domains of a data structure.
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Abstract
The present invention relates to a domain expansion storage medium and processing method for processing a storage medium to obtain an improved readout performance. The magnetic properties of a storage layer (50) of the storage medium are altered by an ion beam projection lithography using a stencil mask to define magnetic domains and/or track patterns and/or servo patterns. Thereby, replication accuracy, speed and readout performance can be improved.
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Citations
12 Claims
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1. A method of processing a domain expansion storage medium in which a magnetic wall is displaced in a readout layer to thereby enlarge a magnetic domain of a storage layer so as to reproduce an information indicated by said magnetic domain, said method comprising the steps of:
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a) depositing said storage layer above a substrate of said storage medium;
b) passing at least one beam of ions through a mask with a predetermined pattern so as to project said predetermined pattern towards said storage layer; and
c) controlling said ion beam so as to alter the magnetic properties of said storage layer at regions below exposed portions in order to define magnetic domains of a data structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A domain expansion storage medium in which a magnetic wall is displaced in a readout layer to thereby enlarge a magnetic domain of a storage layer so as to reproduce the information indicated by said magnetic domain, said storage medium comprising a storage layer processed by selective implantation of ions or atoms with a predetermined pattern to define at least one of a data pattern, a track pattern and a servo pattern.
Specification