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arXiv 2102.01919cond-mat.mtrl-scicond-mat.mes-hall
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基于四元Heusler化合物的欧姆自旋二极管的第一性原理设计

First principles design of Ohmic spin diodes based on quaternary Heusler compounds

T. Aull, E. Şaşıoğlu, I. Mertig

摘要:

欧姆自旋二极管(OSD)是自旋电子学中的一个新概念,它是基于半金属磁体(HALF)和自旋无隙半导体(SGS)。四元Heusler化合物提供了一个独特的平台,以实现用于室温应用的OSD,因为这些材料具有非常高的居里温度以及同一家族中的半金属和无自旋隙半导体行为。使用最先进的第一性原理计算结合非平衡格林函数方法,我们设计了四种不同的基于半金属和自旋无隙半导体四元Heusler化合物的OSD。所有四种OSD都表现出线性电流-电压($I-V$)特性,其中零阈值电压$V_T$。我们发现,这些OSD具有一个小的漏电流,这源于在SGS电极的费米能级周围的相反的自旋通道的导带和价带边缘的重叠。获得的开/关电流比在$30$和$10^5$之间变化。我们的研究结果可以为有序四元Heusler化合物家族中的OSD的实验制备铺平道路。

英文摘要:

The Ohmic spin diode (OSD) is a recent concept in spintronics, which is based on half-metallic magnets (HMMs) and spin-gapless semiconductors (SGSs). Quaternary Heusler compounds offer a unique platform to realize the OSD for room temperature applications as these materials possess very high Curie temperatures as well as half-metallic and spin-gapless semiconducting behavior within the same family. Using state-of-the-art first-principles calculations combined with the non-equilibrium Green's function method we design four different OSDs based on half-metallic and spin-gapless semiconducting quaternary Heusler compounds. All four OSDs exhibit linear current-voltage ($I-V$) characteristics with zero threshold voltage $V_T$. We show that these OSDs possess a small leakage current, which stems from the overlap of the conduction and valence band edges of opposite spin channels around the Fermi level in the SGS electrodes. The obtained on/off current ratios vary between $30$ and $10^5$. Our results can pave the way for the experimental fabrication of the OSDs within the family of ordered quaternary Heusler compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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