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:
Mar. 23, 2004
Filed:
Jul. 13, 2001
Jijun Sun, Saku, JP;
Satoru Araki, Saku, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magnetic tunnel junction device and method for making same is provided. A first ferromagnetic portion is provided. A barrier is provided on the first ferromagnetic portion. The barrier includes a first barrier portion on the first ferromagnetic portion. The first barrier portion is oxidized. After oxidizing, a second barrier portion is provided on the first barrier portion. The second barrier may be oxidized or annealed. A second ferromagnetic portion is provided on the barrier. The barrier of the resultant device has a reduced number of pinholes, minimizing the amount of the non-tunnel current, and an improved symmetry of electrical properties. This leads to advantages in performance characteristics and mass-production of the device.