Method and apparatus for fixed-gap, constant-field...

Details Method and apparatus for fixed-gap, constant-field... Method and apparatus for fixed-gap, constant-field...

2006-01-10

2006-01-10

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

C360S016000

Reexamination Certificate

active

06985314

ABSTRACT:
A method of forming a magnetic transition pattern in a magnetic material by contact printing comprises steps of providing a stacked assembly including a workpiece including a surface comprised of the magnetic material including a plurality of initialized, unidirectionally aligned magnetic domains, and a high saturation magnetization stamper having an imprinting surface in intimate contact with the workpiece surface, the imprinting surface comprising a plurality of projections and depressions arranged in a pattern corresponding to the magnetic transition pattern to be formed in the magnetic material, and selectively magnetically re-aligning the initialized, unidirectionally aligned magnetic domains by placing the assembly in a fixed gap contact printing apparatus including a magnet means having a pair of spaced-apart, stationary magnetic poles providing an oppositely directed, uniform intensity, unidirectional re-alignment magnetic field.

REFERENCES:
patent: 6594099 (2003-07-01), Serizawa
patent: 6747822 (2004-06-01), Saito
patent: 6906876 (2005-06-01), Komatsu et al.

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