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:
Jan. 30, 2024
Filed:
Jun. 23, 2021
Nuvoton Technology Corporation Japan, Kyoto, JP;
Ryutaro Yasuhara, Hyogo, JP;
Satoru Fujii, Osaka, JP;
Takumi Mikawa, Shiga, JP;
Atsushi Himeno, Osaka, JP;
Kengo Nishio, Ibaraki, JP;
Takehide Miyazaki, Ibaraki, JP;
Hiroyuki Akinaga, Ibaraki, JP;
Yasuhisa Naitoh, Ibaraki, JP;
Hisashi Shima, Ibaraki, JP;
Nuvoton Technology Corporation Japan, Kyoto, JP;
Abstract
A variable resistance non-volatile memory element includes first and second electrodes and a variable resistance layer between the electrodes. The layer has a resistance value reversibly variable based on an electrical signal. The layer includes a first variable resistance layer that includes an oxygen deficient first metal oxide containing a first metal element and oxygen, and a second variable resistance layer that includes a composite oxide containing the first metal element, a second metal element different from the first metal element, and oxygen, and having a different degree of oxygen deficiency from the first metal oxide. The composite oxide has a lower degree of oxygen deficiency than the first metal oxide. At room temperature, the composite oxide has a smaller oxygen diffusion coefficient than a second metal oxide containing the first metal element and oxygen, and having the degree of oxygen deficiency equal to that of the composite oxide.