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:
Aug. 17, 2010
Filed:
Aug. 21, 2009
Takayuki Kawahara, Higashiyamato, JP;
Riichiro Takemura, Tokyo, JP;
Kenchi Ito, Kunitachi, JP;
Hiromasa Takahashi, Hachioji, JP;
Takayuki Kawahara, Higashiyamato, JP;
Riichiro Takemura, Tokyo, JP;
Kenchi Ito, Kunitachi, JP;
Hiromasa Takahashi, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a memory using spin transfer torque, state of the spin is made unstable by applying a weak pulse before rewriting to reduce rewrite current. Reading of high-speed operation is performed with current in a regime where the current becomes non-linearly increases corresponding to the pulse width to suppress disturb. Further, fluctuation of respective memory cells is suppressed by a driving method setting the amount of spin constant by bit line charge to suppress read disturb.