The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2013
Filed:
Feb. 20, 2013
Panasonic Corporation, Osaka, JP;
Mitsuteru Iijima, Osaka, JP;
Takeshi Takagi, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Programming a variable resistance element includes: a writing step of applying a writing voltage pulse to transition metal oxide comprising two stacked metal oxide layers to decrease resistance of the metal oxide, each metal oxide layer having different oxygen deficiency; and an erasing step of applying an erasing voltage pulse, of different polarity than the writing pulse, to the metal oxide to increase resistance of the metal oxide. |Vw|>|Vw|. Vwrepresents writing voltage for first to N-th steps. Vwrepresents writing voltage for (N+1)-th and subsequent steps, where N≧1, |Ve|>|Ve|. Verepresents erasing voltage for first to M-th steps. Verepresents erasing voltage for M+1-th and subsequent steps. tw<te. twrepresents writing pulse width for first to N-th steps. terepresents erasing pulse width for first to M-th steps. M≧1. The (N+1)-th writing step follows the M-th erasing step.
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