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. 30, 2010
Filed:
Jan. 08, 2008
Sadamichi Maekawa, Sendai, JP;
Saburo Takahashi, Sendai, JP;
Hiroshi Imamura, Sendai, JP;
Masahiko Ichimura, Kokubunji, JP;
Hiromasa Takahashi, Hachioji, JP;
Sadamichi Maekawa, Sendai, JP;
Saburo Takahashi, Sendai, JP;
Hiroshi Imamura, Sendai, JP;
Masahiko Ichimura, Kokubunji, JP;
Hiromasa Takahashi, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Tohoku University, Miyagi, JP;
Abstract
The present invention aims to reduce heat fluctuations of a memory cell and thereby provide a stable writing operation when a magnetization reversal process not involving a reversal magnetic field is used for writing into the memory cell. The magnetic memory cell has a structure where first and second magnetization pinned terminals are connected, with a space therebetween, to one surface of a non-magnetic region, and a magnetization free terminal is connected to the other surface. Magnetization directions of the first and second magnetization pinned terminals are anti-parallel to each other. Writing is performed by controlling a polarity of a current flowing between the first and second magnetization pinned terminals through the non-magnetic region and thus reversing magnetization of the magnetization free terminal. Reading is performed by detecting a magnetic resistance attributable to a change in relative magnetization direction between the first magnetization pinned terminal and the magnetization free terminal.