Reduction of switching current distribution in spin transfer magnetic random access memories

In this paper, the switching current distribution by spin transfer torque is investigated for Co Fe B ∕ Mg O ∕ Co Fe B magnetic tunnel junctions (MTJs). The distribution of the spin transfer switching current for a MTJ with junction size of 85 × 110 nm 2 is 16% when the duration of applied pulse cur...

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Bibliographic Details
Published in:Journal of applied physics 2008-04, Vol.103 (7), p.07A720-07A720-3
Main Authors: Iwayama, M., Kai, T., Nakayama, M., Aikawa, H., Asao, Y., Kajiyama, T., Ikegawa, S., Yoda, H., Nitayama, A.
Format: Article
Language:English
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Summary:In this paper, the switching current distribution by spin transfer torque is investigated for Co Fe B ∕ Mg O ∕ Co Fe B magnetic tunnel junctions (MTJs). The distribution of the spin transfer switching current for a MTJ with junction size of 85 × 110 nm 2 is 16% when the duration of applied pulse current is 5 ms . In the case of magnetization reversal with magnetic field induced by current with 5 ms pulse duration, the distribution of the switching field is 8.3%. According to our micromagnetic simulation, it is found that the spin transfer current switching seems to exhibit a nonuniform magnetization reversal process, whereas the magnetization switching by the magnetic field exhibits a uniform magnetization reversal process. This leads to the broader distribution related to the repeatability.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2838140