Vol. 15, no.4, 2023
РусскийEnglish
CONDENSED MATTER PHYSICS
SPINTRONICS OF NON-MAGNETIC CHIRAL MEDIA ON THE EXAMPLE OF THE SEEBECK EFFECT
Vyacheslav K. Ignatjev, Sergey V. Perchenko, Dmitry A. Stankevich
Volgograd State University, https://volsu.ru/
Volgograd 400062, Russian Federation
E-mail: vkignatjev@yandex.ru, perchenko@volsu.ru, dimon50002004@yandex.ru
Received July 12, 2023, peer-reviewed July 16, 2023, accepted July 19, 2023, published December 06, 2023.
Abstract: Spin transport in chiral materials is considered as the main direction for the spintronics development. Experimental work on the study of the spin Seebeck effect shows that in chiral materials it is possible to achieve effective generation of spin-polarized current at distances up to several millimeters. In the presented work, we develop a theoretical approach to describe the spin Seebeck effect based on the spin Hamiltonian for conduction electrons in a chiral medium. Taking into account this Hamiltonian, the equation of electron spin dynamics averaged over the polycrystalline sample is obtained. In the approximation of ideal Fermi-gas and local-quasi-equilibrium distribution, the spin density operator of conduction electrons is constructed. It is shown that averaging over randomly oriented crystallites does not destroy spin ordering at strong spin-orbit interaction, and the temperature gradient generates spin polarization directed predominantly along the temperature gradient. Spin polarization by the described in the paper mechanism does not require external magnetic fields and remanent magnetization and therefore does not interfere with the operation of micro- and nano-sized structures of spintronics. Since the spin Seebeck effect is reciprocal with the spin Peltier effect, the theoretical approach presented in this work can form the basis of new methods for controlling heat flow in spintronics systems.
Keywords: spintronics, spin Seebeck effect, spin-orbit interaction, chiral crystal, polycrystalline conductor
PACS: 67.57.Lm, 72.25.Ba, 75.76.+j
RENSIT, 2023, 15(1):385-392e DOI: 10.17725/rensit.2023.15.385
Full-text electronic version of this article - web site http://en.rensit.ru/vypuski/article/520/15(4)385-392e.pdf