Analysis of self-heating of thermally assisted spin-transfer torque magnetic random access memory

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ID: 87890
2016
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Abstract
Thermal assistance has been shown to significantly reduce the required operation power for spin torque transfer magnetic random access memory (STT-MRAM). Proposed heating methods include modified material stack compositions that result in increased self-heating or external heat sources. In this work we analyze the self-heating process of a standard perpendicular magnetic anisotropy STT-MRAM device through numerical simulations in order to understand the relative contributions of Joule, thermoelectric Peltier and Thomson, and tunneling junction heating. A 2D rotationally symmetric numerical model is used to solve the coupled electro-thermal equations including thermoelectric effects and heat absorbed or released at the tunneling junction. We compare self-heating for different common passivation materials, positive and negative electrical current polarity, and different device thermal anchoring and boundaries resistance configurations. The variations considered are found to result in significant differences in maximum temperatures reached. Average increases of 3 K, 10 K, and 100 K for different passivation materials, positive and negative polarity, and different thermal anchoring configurations, respectively, are observed. The highest temperatures, up to 424 K, are obtained for silicon dioxide as the passivation material, positive polarity, and low thermal anchoring with thermal boundary resistance configurations. Interestingly it is also found that due to the tunneling heat, Peltier effect, device geometry, and numerous interfacial layers around the magnetic tunnel junction (MTJ), most of the heat is dissipated on the lower potential side of the magnetic junction. This asymmetry in heating, which has also been observed experimentally, is important as thermally assisted switching requires heating of the free layer specifically and this will be significantly different for the two polarity operations, set and reset.
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deschenes2016analysisbeilstein Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Deschenes, Austin;Muneer, Sadid;Akbulut, Mustafa;Gokirmak, Ali;Silva, Helena;
Journal beilstein journal of nanotechnology
Year 2016
DOI
DOI not found
URL
https://doi.org/10.3762/bjnano.7.160
Keywords
Materials of engineering and construction. Mechanics of materials Chemical technology Technology Science Diseases of the circulatory (Cardiovascular) system physics general works medical physics. medical radiology. nuclear medicine

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