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A non-erasable magnetic memory based on the magnetic permeability.

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Title: A non-erasable magnetic memory based on the magnetic permeability.
Authors: Petrie, J.R.1, Wieland, K.A.1, Burke, R.A.1, Newburgh, G.A.1, Burnette, J.E.2, Fischer, G.A.1, Edelstein, A.S.1 alan.s.edelstein.civ@us.army.mil
Source: Journal of Magnetism & Magnetic Materials. Jun2014, Vol. 361, p262-266. 5p.
Subjects: Erasable programmable read-only memory, Magnetic memory (Computers), Magnetic permeability, Sputtering (Physics), Metallic glasses
Abstract: Abstract: A non-erasable memory based on using differences in the magnetic permeability is demonstrated. The method can potentially store information indefinitely. Initially the high permeability bits were 10–50μm wide lines of sputtered permalloy (Ni81Fe19) on a glass substrate. In a second writing technique a continuous film of amorphous, high permeability ferromagnetic Metglas (Fe78Si13B9) was sputtered onto a similar glass substrate. Low permeability, crystalline 50μm wide lines were then written in the film by laser heating. Both types of written media were read by applying an external probe field that is locally modified by the permeability of each bit. The modifications in the probe field were read by a nearby set of 10 micron wide magnetic tunnel junctions with a signal-to-noise ratio of up to 45dB. This large response to changes in bit permeability is not altered after the media has been exposed to a 6400Oe field. While being immediately applicable for data archiving and secure information storage, higher densities are possible with smaller read and write heads. [Copyright &y& Elsevier]
Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 95510430
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: A non-erasable magnetic memory based on the magnetic permeability.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Jun2014, Vol. 361, p262-266. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Erasable+programmable+read-only+memory%22">Erasable programmable read-only memory</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+memory+%28Computers%29%22">Magnetic memory (Computers)</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+permeability%22">Magnetic permeability</searchLink><br /><searchLink fieldCode="DE" term="%22Sputtering+%28Physics%29%22">Sputtering (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+glasses%22">Metallic glasses</searchLink>
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  Data: Abstract: A non-erasable memory based on using differences in the magnetic permeability is demonstrated. The method can potentially store information indefinitely. Initially the high permeability bits were 10–50μm wide lines of sputtered permalloy (Ni81Fe19) on a glass substrate. In a second writing technique a continuous film of amorphous, high permeability ferromagnetic Metglas (Fe78Si13B9) was sputtered onto a similar glass substrate. Low permeability, crystalline 50μm wide lines were then written in the film by laser heating. Both types of written media were read by applying an external probe field that is locally modified by the permeability of each bit. The modifications in the probe field were read by a nearby set of 10 micron wide magnetic tunnel junctions with a signal-to-noise ratio of up to 45dB. This large response to changes in bit permeability is not altered after the media has been exposed to a 6400Oe field. While being immediately applicable for data archiving and secure information storage, higher densities are possible with smaller read and write heads. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jmmm.2014.01.018
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        Text: English
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      – SubjectFull: Magnetic memory (Computers)
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      – SubjectFull: Magnetic permeability
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      – SubjectFull: Sputtering (Physics)
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      – SubjectFull: Metallic glasses
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              Text: Jun2014
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