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arXiv · 2008.00412

Thermal stability for domain wall mediated magnetization reversal in perpendicular STT MRAM cells with W insertion layers

G. Mihajlovic·N. Smith·T. Santos·J. Li·B. D. Terris·J. A. Katine
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Abstract

We present an analytical model for calculating energy barrier for the magnetic field-driven domain wall-mediated magnetization reversal of a magneto-resistive random access memory (MRAM) cell and apply it to study thermal stability factor $\Delta$ for various thicknesses of W layers inserted into the free layer (FL) as a function of the cell size and temperature. We find that, by increasing W thickness, the effective perpendicular magnetic anisotropy (PMA) energy density of the FL film monotonically increases, but at the same time, $\Delta$ of the cell mainly decreases. Our analysis shows that, in addition to saturation magnetization $M_s$ and exchange stiffness constant $A_\mathrm{ex}$ of the FL film, the parameter that quantifies the $\Delta$ of the cell is its coercive field $H_c$, rather than the net PMA field $H_k$ of the FL film comprising the cell.

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G. Mihajlovic, N. Smith, T. Santos, J. Li, B. D. Terris, J. A. Katine. 2020-08-02. Thermal stability for domain wall mediated magnetization reversal in perpendicular STT MRAM cells with W insertion layers. https://doi.org/10.1063/5.0023852

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