Spin Pumping into Anisotropic Dirac Electrons

Abstract

We study spin pumping into an anisotropic Dirac electron system induced by microwave irradiation to an adjacent ferromagnetic insulator theoretically. We formulate the Gilbert damping enhancement due to the spin current flowing into the Dirac electron system using second-order perturbation with respect to the interfacial exchange coupling. As an illustration, we consider the anisotropic Dirac system realized in bismuth to show that the Gilbert damping varies according to the magnetization direction in the ferromagnetic insulator. Our results indicate that this setup can provide helpful information on the anisotropy of the Dirac electron system.

10 pages, 6 figures

References in corpus (12)

• Topological Insulators with Inversion Symmetry
• Surface States of the Topological Insulator Bi_{1-x}Sb_x
• Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers
• Transport Properties and Diamagnetism of Dirac Electrons in Bismuth
• Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
• Spin current noise of the spin Seebeck effect and spin pumping
• Microscopic theory of spin transport at the interface between the superconductor and a ferromagnetic insulator
• Spin-Hall Effect and Diamagnetism of Dirac Electrons
• Spin-Hall Effect and Diamagnetism of Anisotropic Dirac Electrons in Solids
• Ferromagnetic resonance modulation in $d$-wave superconductor/ferromagnetic insulator bilayer systems
• Intrinsic and Extrinsic Spin Hall Effects of Dirac Electrons
• Spin current at a magnetic junction as a probe of the Kondo state

Cited by in corpus (7)

• Theory of inverse Rashba-Edelstein effect induced by spin pumping into a two-dimensional electron gas
• Twisted bilayer graphene reveals its flat bands under spin pumping
• Spin Pumping into Carbon Nanotubes
• Spin Pumping into two-dimensional systems
• Spin pumping into quantum spin chains
• Microscopic theory of Rashba-Edelstein magnetoresistance
• Theory of spin pumping and inverse Rashba-Edelstein effect in a two-dimensional electron gas