G–C4N3–graphene-g-C4N3: A useful spin thermoelectric material. (September 2021)

• Record Type: Journal Article
• Authors: Bhowmick, Rinki; Koley, Sayantanu; Chattopadhyaya, Mausumi; Sen, Sabyasachi
• Is Part Of: Journal of physics and chemistry of solids. Volume 156(2021)
• Publication Date: 2021-09
• Subjects: Spin seebeck effect -- Graphitic carbon nitride -- DFT -- NEGF -- Spin caloritronics; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2021.110186
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract : Present investigation establishes simple 2D tunnelling nanostructure created by an assembly of ferromagnetic g-C4 N3 electrodes separated by insulating graphene sheet; as a potential spincaloritronic device. The system shows large departure in up and down spin component of Seebeck coefficient and spin thermoelectric figure of merit is 10 3 times larger than charge part. Emergence of spin polarized Seebeck coefficient may be attributed to intrinsic ferromagnetism of g-C4 N3 and spin-injection from ferromagnetic electrode to insulating graphene. This widely varying spin polarized Seebeck coefficient is attributed to large negative slope of logarithmic transmission coefficient of spin up channel compared to spin down counterpart. Graphical abstract: Temperature dependence of charge and spin part of thermoelectric figure merit and spin polarized thermoelectric figure merit explain decisive role of spin polarized Seebeck coefficient in determining overall thermoelectric performance of the system. Image 1 Highlights: A non-magnetic-ferro-magnetic interfacehas been established by creating an interface of g-C4N3 and graphene. The spin thermoelectric figure of merit of the system is 10 3 times larger than that of its charge part. Emergence of spin polarized Seebeck coefficient is due to spin injection from g-C4N3 electrodes to insulting graphene sheet.