Time-resolved studies of the spin-transfer reversal mechanism in perpendicularly magnetized magnetic tunnel junctions

被引：45

作者：

Hahn, Christian ^{[1
]}

Wolf, Georg ^{[1
,2
]}

Kardasz, Bartek ^{[2
]}

Watts, Steve ^{[2
]}

Pinarbasi, Mustafa ^{[2
]}

Kent, Andrew D. ^{[1
]}

机构：

[1] NYU, Dept Phys, New York, NY 10003 USA

[2] Spin Transfer Technol Inc, Fremont, CA 94538 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 21期

关键词：

BODY;

D O I：

10.1103/PhysRevB.94.214432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pulsed spin-torque switching has been studied using single-shot time-resolved electrical measurements in perpendicularly magnetized magnetic tunnel junctions as a function of pulse amplitude and junction size in 50 to 100nm-diameter diameter circular junctions. The mean switching time depends inversely on pulse amplitude for all junctions studied. However, the switching dynamics is found to be strongly dependent on junction size and pulse amplitude. In 50-nm-diameter junctions the switching onset is stochastic but the switching once started, is fast; after being initiated it takes less than 2 ns to switch. In larger diameter junctions the time needed for complete switching is strongly dependent on the pulse amplitude, reaching times less than 2 ns at large pulse amplitudes. Anomalies in the switching rate versus pulse amplitude are shown to be associated with the long-lived (> 2ns) intermediate junction resistance states.

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