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首页> 外文期刊>Physical review >Spincaloric properties of epitaxial Co_2MnSi/MgO/Co_2MnSi magnetic tunnel junctions
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Spincaloric properties of epitaxial Co_2MnSi/MgO/Co_2MnSi magnetic tunnel junctions

机译：外延Co_2MnSi / MgO / Co_2MnSi磁性隧道结的自发热性能

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摘要

The electronic transport and spincaloric properties of epitaxial magnetic tunnel junctions with half-metallic Co_2MnSi Heusler electrodes, MgO tunneling barriers, and different interface terminations are investigated by using first-principles calculations. An approach to spincaloric properties is presented that circumvents the linear response approximation inherent in the Seebeck coefficient and compared to the method of Sivan and Imry. This approach supports two different temperatures in the two electrodes and provides the exact current and/or voltage response of the system. Moreover, it accounts for temperature-dependent chemical potentials in the electrodes and finite-bias effects. We find that especially the former are important for obtaining qualitatively correct results, even if the variations of the chemical potentials are small. It is shown how the spincaloric properties can be tailored by the choice of the growth conditions. We find a large effective and spin-dependent Seebeck coefficient of -65 μV/K at room temperature for the purely Co-terminated interface. We suggest to use such interfaces in thermally operated magnetoresistive random access memory modules, which exploit the magneto-Seebeck effect, to maximize the thermally induced readout voltage.
机译：通过第一性原理计算研究了具有半金属Co_2MnSi Heusler电极，MgO隧穿势垒和不同界面终端的外延磁性隧道结的电子输运和自发热性能。提出了一种解决自发热量特性的方法，该方法规避了塞贝克系数固有的线性响应近似，并与Sivan和Imry的方法进行了比较。该方法在两个电极中支持两个不同的温度，并提供系统的确切电流和/或电压响应。此外，它解释了电极中与温度有关的化学势和有限偏置效应。我们发现，即使化学势的变化很小，前者对于获得定性正确的结果也很重要。它显示了如何通过选择生长条件来调节自发热量性质。我们发现在室温下，纯共端接的界面具有很大的有效和自旋相关的塞贝克系数，为-65μV/ K。我们建议在利用磁塞贝克效应的热操作磁阻随机存取存储器模块中使用此类接口，以最大程度地提高热感应读出电压。

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