Rewriting magnetic phase change memory by laser heating

Magnetic phase change memory (MAG PCM) consists of bits with different magnetic permeability values. The bits are read by measuring their effect on a magnetic probe field. Previously low permeability crystalline bits had been written in high permeability amorphous films of Metglas via laser heating....

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2016-04, Vol.49 (16), p.165005-165010
Main Authors: Timmerwilke, John, Liou, Sy-Hwang, Cheng, Shu Fan, Edelstein, Alan S
Format: Article
Language:English
Subjects:
Crystal structure
Crystallization
Laser beam heating
Lasers
magnetic
Magnetic permeability
Magnetic probes
Mathematical models
memory
Phase change
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Summary:Magnetic phase change memory (MAG PCM) consists of bits with different magnetic permeability values. The bits are read by measuring their effect on a magnetic probe field. Previously low permeability crystalline bits had been written in high permeability amorphous films of Metglas via laser heating. Here data is presented showing that by applying short laser pulses with the appropriate power to previously crystallized regions they can first be vitrified and then again crystallized. Thus, MAG PCM is rewriteable. Technical issues in processing the bits are discussed and results on thermal modeling are presented.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/49/16/165005