TITLE

Adjustable spin torque in magnetic tunnel junctions with two fixed layers

AUTHOR(S)
Fuchs, G. D.; Krivorotov, I. N.; Braganca, P. M.; Emley, N. C.; Garcia, A. G. F.; Ralph, D. C.; Buhrman, R. A.
PUB. DATE
April 2005
SOURCE
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p152509
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have fabricated nanoscale magnetic tunnel junctions (MTJs) with an additional fixed magnetic layer added above the magnetic free layer of a standard MTJ structure. This acts as a second source of spin-polarized electrons that, depending on the relative alignment of the two fixed layers, either augments or diminishes the net spin torque exerted on the free layer. The compound structure allows a quantitative comparison of spin torque from tunneling electrons and from electrons passing through metallic spacer layers, as well as analysis of Joule self-heating effects. This has significance for current-switched magnetic random access memory, where spin torque is exploited and, for magnetic sensing, where it is detrimental.
ACCESSION #
17185425

 

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