Giant dynamical electron-magnon coupling in metal-metal-ferromagnetic insulator heterostructure
Abstract
Magnon-mediated spin transport across nonmagnetic metal (NM) and ferromagnetic insulator (FI) interface depends critically on electron-magnon coupling. We propose a novel route to enhance electron-magnon coupling dynamically from transport viewpoint. Using non-equilibrium Green's function a theoretical formalism for magnon-mediated spin current is developed. In the language of transport, the effective electron-magnon coupling at NM/FI interface is determined by self-energy of FI lead, which is proportional to density of states (DOS) at NM/FI interface due to nonlinear process of electron-magnon conversion. By modifying interfacial DOS, the spin conductance of 2D and 3D NM/FI systems can be increased by almost three orders of magnitude, setting up a new platform of manipulating dynamical electron-magnon coupling.
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Cite
@article{arxiv.2112.11021,
title = {Giant dynamical electron-magnon coupling in metal-metal-ferromagnetic insulator heterostructure},
author = {Gaoyang Li and Hao Jin and Yadong Wei and Jian Wang},
journal= {arXiv preprint arXiv:2112.11021},
year = {2022}
}