Orbital magnetization and its effects in spin-chiral ferromagnetic kagome lattice in the general spin-coupling region

TL;DR

This paper theoretically investigates how orbital magnetization in a spin-chiral kagome lattice is influenced by Hund's coupling and spin chirality, revealing opposing contributions and a characteristic anomalous Nernst response.

Contribution

It introduces a comprehensive analysis of orbital magnetization components and their dependence on Hund's coupling and spin chirality in a kagome lattice.

Findings

Orbital magnetization has two opposing parts: conventional and Berry-phase correction.

The strength of Hund's coupling and spin chirality significantly affect magnetization.

Anomalous Nernst conductivity exhibits a peak-valley structure as a function of Fermi energy.

Abstract

The orbital magnetization and its effects on the two-dimensional kagom\'{e} lattice with spin anisotropies included in the general Hund's coupling region have been theoretically studied. The results show that the strength of the Hund's coupling, as well as the spin chirality, contributes to the orbital magnetization $\mathcal{M}$. Upon varying both these parameters, it is found that the two parts of $\mathcal{M}$, i.e., the conventional part $\mathbf{M}_{c}$ and the Berry-phase correction part $\mathbf{M}_{\Omega}$, oppose each other. The anomalous Nernst conductivity is also calculated and a peak-valley structure as a function of the electron Fermi energy is obtained.