Methods and Materials for Magnetic Recording While Avoiding the Superparamagetic Limit

The present invention is, in one aspect, a high anisotropy magnetic composite, having a plurality of ferromagnetic particles, where these ferromagnetic particles are disposed within an antiferromagnetic material, which may either be a coating for the particles, or a matrix in which the particles are...

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Bibliographic Details
Main Author: Edelstein, Alan S
Format: Report
Language:English
Subjects:
ANISOTROPY
ANTIFERROMAGNETISM
Electricity and Magnetism
FERROMAGNETIC MATERIALS
INFORMATION RETRIEVAL
MAGNETIC FIELDS
MAGNETIC MATERIALS
MAGNETIC RECORDING SYSTEMS
MATRIX MATERIALS
PARAMAGNETISM
Recording and Playback Devices
SUPERPARAMAGNETIC
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Description
Summary:The present invention is, in one aspect, a high anisotropy magnetic composite, having a plurality of ferromagnetic particles, where these ferromagnetic particles are disposed within an antiferromagnetic material, which may either be a coating for the particles, or a matrix in which the particles are disposed; and a matrix material (antiferromagnetic or otherwise). Typically, this material will be disposed on a substrate. In another aspect, the invention is a method for magnetically recording data, comprising the step of exposing a magnetic recording medium according to the invention to a writing magnetic field. In another aspect, the invention is a method for reading magnetically recorded data, comprising the steps of positioning a read head in proximity to a magnetic recording medium according to the invention, where the read head can read the magnetization of a region on the magnetic recording medium, and translating the read head relative to the magnetic recording medium, where the read head is thus sequentially brought into proximity to a plurality of separately written regions on the magnetic recording medium.