Controlling the demagnetizing field of an in-plane free layer by exchange coupling with a perpendicular multilayer

Yong Chang Lau (), Kaan Oguz, Karsten Rode and J.M.D. Coey

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 3, 1-5

Abstract: The demagnetizing field of a Co 50 Fe 50 free layer in an in-plane micron-sized magnetic tunnel junction (MTJ) can be partially compensated by exchange coupling with a [Co 90 Fe 10 /Pt] N multilayer with perpendicular magnetic anisotropy via a Ru interlayer. The perpendicular anisotropy for N = 5 is optimized for nominal CoFe and Pt thickness of 0.4 nm and 1.0 nm, respectively. An increase of tunnel magnetoresistance (TMR) from 2% to 75% is observed in MTJs as the free layer thickness, t varies from 1.0 nm to 3.0 nm. A phenomenological model is developed to interpret the TMR dependence in terms of the free layer magnetization rotation from in-plane to out-of-plane with decreasing t, a consequence of interlayer exchange coupling with the perpendicular multilayer. We suggest that this strategy could significantly reduce the switching current density in such MTJs. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Date: 2013
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DOI: 10.1140/epjb/e2013-30680-8

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