Spin Seebeck effect and thermal colossal magnetoresistance in Christmas-tree silicene nanoribbons
Xiu-Jin Gao, Peng Zhao, Gang Chen
Index: 10.1016/j.cplett.2018.03.073
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Abstract
Based on the density functional theory and nonequilibrium Green’s function method, we investigate the electronic structures and thermal spin transport properties of Christmas-tree silicene nanoribbons (CSiNRs). The results show that CSiNRs have ferromagnetic ground state with high Curie temperature far above the room temperature. Obvious spin Seebeck effect with spin-up and spin-down currents flowing in opposite directions by a temperature gradient can be observed in these systems. Furthermore, a thermal colossal magnetoresistance up to 109% can be realized by tuning the external magnetic field. The results show that CSiNRs hold great potential in designing spin caloritronic devices.