Patent ID: 11889776
Assignee: NUVOTON TECHNOLOGY CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 0:
1. A variable resistance non-volatile memory element, comprising:
a first electrode;
a second electrode; and
a variable resistance layer between the first electrode and the second electrode, the variable resistance layer having a resistance value reversibly variable based on an electrical signal applied between the first electrode and the second electrode, wherein
the variable resistance layer includes:
a first variable resistance layer that includes a first metal oxide of an oxygen-deficient type, the 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, the composite oxide having a degree of oxygen deficiency different from a degree of oxygen deficiency of the first metal oxide,

the degree of oxygen deficiency of the composite oxide is lower than the degree of oxygen deficiency of the first metal oxide,
the composite oxide has, at room temperature, an oxygen diffusion coefficient smaller than an oxygen diffusion coefficient, at the room temperature, of a second metal oxide containing the first metal element and oxygen, and having a degree of oxygen deficiency equal to the degree of oxygen deficiency of the composite oxide, and
the first variable resistance layer and the second variable resistance layer are both amorphous.