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:
May. 15, 2007
Filed:
Apr. 01, 2005
Hyun-jo Kim, Hwaseong-si, KR;
Jang-eun Lee, Suwon-si, KR;
Se-chung OH, Yongin-si, KR;
Jun-soo Bae, Hwasoeng-si, KR;
Young-ki Ha, Suwon-si, KR;
Kyung-tae Nam, Suwon-si, KR;
Hyun-Jo Kim, Hwaseong-si, KR;
Jang-Eun Lee, Suwon-si, KR;
Se-Chung Oh, Yongin-si, KR;
Jun-Soo Bae, Hwasoeng-si, KR;
Young-Ki Ha, Suwon-si, KR;
Kyung-Tae Nam, Suwon-si, KR;
Abstract
A method of writing to magnetic random access memory (MRAM) devices is provided. The method includes preparing a digit line disposed on a semiconductor substrate, a bit line crossing over the digit line, and a magnetic tunnel junction (MTJ) interposed between the digit line and the bit line. The MTJ has a pinned layer, a tunneling insulating layer, and a synthetic anti-ferromagnetic (SAF) free layer which are sequentially stacked. In addition, the SAF free layer has a bottom free layer and a top free layer which are separated by an exchange spacer layer. An initial magnetization state of the MTJ is read and compared with a desired magnetization state. When the initial magnetization state is different from the desired magnetization state, a first write line pulse is applied to one of the digit line and the bit line, and a second write line pulse is applied to the other of the digit line and the bit line, thereby changing the magnetization state of the MTJ. The MTJ may be disposed at an angle equal to or greater than 0° and less than 90° to a line to which the second write line pulse is applied.