Controlling the demagnetizing field of an in-plane free layer by exchange coupling with a perpendicular multilayer |
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Authors: | Email author" target="_blank">Yong Chang?LauEmail author Kaan?Oguz Karsten?Rode JMD?Coey |
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Institution: | 1.School of Physics and CRANN, Trinity College,Dublin 2,Ireland |
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Abstract: | The demagnetizing field of a Co50Fe50 free layer in an in-planemicron-sized magnetic tunnel junction (MTJ) can be partially compensated by exchangecoupling with a Co90Fe10/Pt] N multilayer with perpendicular magnetic anisotropy via a Ru interlayer. The perpendicularanisotropy for N = 5 is optimized for nominal CoFe and Pt thicknessof 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 variesfrom 1.0 nm to 3.0 nm. A phenomenological model is developed to interpret the TMRdependence in terms of the free layer magnetization rotation from in-plane to out-of-planewith decreasing t, a consequence of interlayer exchange coupling with theperpendicular multilayer. We suggest that this strategy could significantly reduce theswitching current density in such MTJs. |
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