Subnanosecond magnetization reversal in magnetic nanopillars by spin angular momentum transfer

Sub-ns magnetization switching has been triggered by spin momentum transfer in pulsed current in pillar shaped CoFe ∕ Cu ∕ CoFe trilayers. By analyzing the change in magneto-resistance induced after the application of individual short current pulses ( 100 ps - 10 ns ) , we measured the probability o...

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Bibliographic Details
Published in:Applied physics letters 2004-11, Vol.85 (22), p.5358-5360
Main Authors: Tulapurkar, A. A., Devolder, T., Yagami, K., Crozat, P., Chappert, C., Fukushima, A., Suzuki, Y.
Format: Article
Language:English
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Summary:Sub-ns magnetization switching has been triggered by spin momentum transfer in pulsed current in pillar shaped CoFe ∕ Cu ∕ CoFe trilayers. By analyzing the change in magneto-resistance induced after the application of individual short current pulses ( 100 ps - 10 ns ) , we measured the probability of magnetization reversal as a function of the current pulse magnitude, polarity and duration, at various temperatures between 150 and 300 K . At all studied temperatures, the reversal process can take place within a few 100 ps . The energy cost of the reversal scales favorably with the switching speed and decreases in the 1 pJ range when using 100 ps current pulses at 300 K . Significantly higher switching speeds are obtained at lower temperatures, which is opposite to a thermal activation of the reversal.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1828222