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(a) Resistance of the MTJ as a function of external magnetic field . (b) Time-dependence of output voltage measured under of 0.5 mA and of 127 Oe. In this case, the switching time was 22 ms. (c) Cumulative switching probability as a function of time. Open circles and the solid line represent experimental results and least-squares fitting to Eq. (1) with . (d) as a function of . Solid symbols represent experiments under . Solid lines represent least-squares fitting to Eq. (2).
(a) and (b) as a function of for F-coupled Sy (solid symbols) and AF-coupled Sy (open symbols). Solid lines shown in (a) are least-squares fitting to Eq. (3). The -intercepts correspond to and and the -intercepts to and . Solid lines in (b) are linearly fitted. The -intercepts correspond to and .
, , and of the MTJs with the CoFeB/Ru/CoFeB synthetic free layers. F-coupled Sy (AF-coupled Sy) corresponds to the ferromagnetically (antiferromagnetically) coupled synthetic free layer. The values represent averages of several samples.
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