Abstract
Nanoribbons based on low-dimensional materials are potential candidates for nanoscale spintronics devices. Here, some ferromagnetic silicene nanoribbons with zigzag and Klein edges (N-ZKSiNRs) are constructed. It is demonstrated that the N-ZKSiNRs with various widths (N) are placed in various spin-resolved electronic situations. With the increase of the width parameter N from 4 to 19, the N-ZKSiNRs pass from the indirect-gap bipolar magnetic semiconducting state (BMS) to the bipolar spin-gapless semiconductor (BSGS) and eventually to half-metallicity (HM). Moreover, applying a temperature gradient through the nanoribbons leads to spin-dependent current with the opposite flowing and spin orientations, demonstrating the spin-dependent Seebeck effect (SDSE). Besides, it was found that the BSGS phase is superior to the BMS and HM for generating SDSE. These findings confirm that the ZKSiNRs are promising choices for spin caloritronics devices.
Highlights
As a combination of spintronics and thermoelectronics, spin caloritronics performs an essential task in the growth of basic sciences and new low-power consumption technologies [1,2,3,4,5,6]
Many advanced influences have been discovered in spin caloritronics in recent years, such as the spin-dependent Seebeck effect (SDSE) [7,8,9,10], thermal spin-filtering effect (TSFE) [11,12,13], the spin-Seebeck diode effect [14,15,16,17,18,19,20], and the thermal giant magnetoresistance effect (TGMRE) [21, 22]
Ding and Wang [31] found that the silicene nanoribbons with zigzag and Klein edges are more stable than unreconstructed zigzag edges under the medium and H-rich environments. erefore, in the current work, the thermal spin-related transport characteristic and electronic structures of ZKSiNRs were investigated based on ab initio computations incorporated with nonequilibrium Green’s function technique and demonstrated that the ZKSiNRs could have stable ferromagnetic states, and the Advances in Condensed Matter Physics
Summary
As a combination of spintronics and thermoelectronics, spin caloritronics performs an essential task in the growth of basic sciences and new low-power consumption technologies [1,2,3,4,5,6]. We utilized GNRs and silicene nanoribbons (SiNRs) with armchair or zigzag edges to construct spin caloritronics devices and realize marvelous thermal spin transport features such as SDSE [15, 24,25,26] and TSFE [24,25,26]. It was indicated that the analysis of the SDSE on zigzag SiNRs (ZSiNRs) with reconstructed edges, i.e., the Klein edge and the pentagon-heptagon, is rare These two kinds of reconstructed edges for zigzag GNRs have been seen during the experiments [27, 28], and their substantial impacts on the electronic structures and magnetic states of ZGNRs have been demonstrated theoretically [29, 30]. According to the obtained results, ZKSiNRs can be adopted to construct spin caloritronics devices
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