# Conversion of electronic to magnonic spin current at heavy-metal magnetic-insulator interface

## TL;DR

This paper demonstrates that electronic spin currents can be non-linearly converted into magnonic spin currents at heavy-metal magnetic-insulator interfaces, revealing asymmetric and current-dependent behaviors supported by analytical and numerical analysis.

## Contribution

It introduces a comprehensive analysis of non-linear effects in the conversion of electronic to magnonic spin currents, extending understanding beyond the linear regime.

## Key findings

- Thermal magnons exhibit asymmetry with respect to charge current direction.
- Magnonic spin current shows nonlinear dependence on charge current density.
- Results align with recent experiments on electrical manipulation of spin.

## Abstract

Electronic spin current is convertible to magnonic spin current via the creation or annihilation of thermal magnons at the interface of a magnetic insulator and a metal with a strong spin-orbital coupling. So far this phenomenon was evidenced in the linear regime. Based on analytical and fulledged numerical results for the non-linear regime we demonstrate that the generated thermal magnons or magnonic spin current in the insulator is asymmetric with respect to the charge current direction in the metal and exhibits a nonlinear dependence on the charge current density, which is explained by the tuning effect of the spin Hall torque and the magnetization damping. The results are also discussed in light of and are in line with recent experiments pointing to a new way of non-linear manipulation of spin with electrical means.