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Communication Dans Un Congrès Année : 2023

Dipolar core-shell cells with enhanced write speed and reduced cross-talk of perpendicular shape anisotropy MRAM

Résumé

The concept of Perpendicular Shape-Anisotropy Spin-Transfer-Torque Magnetic Random-Access Memory (PSA-STT-MRAM) tackles the downsize scalability limit of conventional ultrathin magnetic tunnel junctions (MTJ) below sub-20 nm technological nodes. It is based on a thick storage layer, enhancing the thermal stability factor ∆ of the device via perpendicular shape anisotropy. However, this comes at the expense of a tendency for a non-reversal mechanism, increasing the switching time and capping the stability of the device versus aspect ratio. Besides, the high aspect ratio and volume supporting thermal stability significantly increase the stray field in neighbouring bits in comparison with the conventional MTJs, in the case of dense arrays. In this work, we show that, by making use of a dipolar-coupled core-shell structure as a storage layer for the PSA-MTJ, both the reversal mechanism and stray field challanges are largely improved. We use macrospin simulations in an array to show the decrease in stray field, and micromagnetic simulations to show the faster switching times while avoiding the domain-wall limit, for a given thermal stability.
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Dates et versions

hal-04608355 , version 1 (11-06-2024)

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Nuno Caçoilo, Ricardo Sousa, Bernard Dieny, Liliana Buda-Prejbeanu, Olivier Fruchart, et al.. Dipolar core-shell cells with enhanced write speed and reduced cross-talk of perpendicular shape anisotropy MRAM. 2023 IEEE International Magnetic Conference, May 2023, Sendai, Japan. pp.1-2, ⟨10.1109/INTERMAGShortPapers58606.2023.10228418⟩. ⟨hal-04608355⟩
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