Enhancement of Thermopower by Structural Asymmetry in Double-Barrier Tunnel Junctions

被引：0
|
作者：
Reza Daqiq
机构：
[1] Malayer University,Department of Physics
来源：
Journal of Superconductivity and Novel Magnetism | 2018年 / 31卷
关键词：
Thermopower; Double-barrier MTJs; Structural asymmetry; Voltage drop;
D O I：
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中图分类号：
学科分类号：
摘要：
Thermopower is studied in double-barrier magnetic tunnel junctions (DBMTJs) with a non-magnetic metal (NM) spacer by considering structural asymmetry—related to the different thicknesses of the MgO insulators—in the linear response regime. Using non-equilibrium Green’s function (NEGF) formalism, it is found that the thermopower is larger in the case with thicker left insulator than the other cases which is related to the voltage drop within the insulator layer. The thermopower has shown its maximum value as large as S = 482μ V/K in the anti-parallel configuration of the magnetizations and T = 300K. Therefore, it is possible to achieve the large thermopower in the thermoelectric devices based on MTJs.
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页码：313 / 316
页数：3
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