26 September 2013 Structural optimization of MTJs with a composite free layer
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We investigate the switching statistics dependence on cell geometry by means of systematic micromagnetic simulations. We find that MTJs with a free layer composed of two ellipses with the axes a/2 and b inscribed into a rectangle a × b are characterized by the same switching speed and thermal stability as MTJs with a composite free layer (C-MTJs). As has been shown, the C-MTJs demonstrate a substantial decrease of the switching time and the switching current as compared to conventional MTJs with a monolithic free layer. Thus, while preserving all the advantages of the C-MTJs, the newly proposed structure does not require a narrow gap between the two parts of the composite layer and therefore can be easily fabricated.
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Alexander Makarov, Alexander Makarov, Viktor Sverdlov, Viktor Sverdlov, Siegfried Selberherr, Siegfried Selberherr, "Structural optimization of MTJs with a composite free layer", Proc. SPIE 8813, Spintronics VI, 88132Q (26 September 2013); doi: 10.1117/12.2025568; https://doi.org/10.1117/12.2025568

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