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

M. Iwayama, T. Kai, M. Nakayama, H. Aikawa, Y. Asao, T. Kajiyama, S. Ikegawa, H. Yoda, A. Nitayama

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

In this paper, the switching current distribution by spin transfer torque is investigated for CoFeBMgOCoFeB magnetic tunnel junctions (MTJs). The distribution of the spin transfer switching current for a MTJ with junction size of 85×110 nm2 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.

Original languageEnglish
Article number07A720
JournalJournal of Applied Physics
Volume103
Issue number7
DOIs
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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