# Electric-Field Tunable Anisotropic g‑Factor Induced by Spin Pumping

## TL;DR

This paper shows that spin pumping can change the g-factor in a 2DEG system, and this change can be controlled with an electric field.

## Contribution

The paper experimentally demonstrates electric-field tunable anisotropic g-factor modulation due to spin pumping.

## Key findings

- Spin pumping induces an anisotropic g-factor with 2-fold symmetry in a Py/AlOx/STO system.
- The g-factor anisotropy can be tuned by applying an external electric field.
- The effect is observed below the onset temperature of the 2DEG.

## Abstract

Spin pumping, a well-established
phenomenon where the precessing
magnetization of a ferromagnet (FM) injects a pure spin current into
an adjacent nonmagnetic layer, is characteristically identified by
the enhancement of magnetic damping in the FM. Theoretical work has
also suggested that spin pumping can affect the Landé g-factoranother key parameter of ferromagnetic materials
besides the magnetic damping. However, experimental evidence of this
effect has remained limited. Here, we demonstrate that spin pumping
can lead to significant modulation of the g-factor
in a Py/AlO
x
/STO two-dimensional electron
gas (2DEG) system with strong spin–orbit interaction. Specifically,
we observe an anisotropic g-factor with 2-fold symmetry
below the onset temperature of the 2DEG, and furthermore this anisotropy
can be tuned when applying an external electric field. This work uncovers
a previously overlooked effect and offers new possibilities for controlling
magnetization dynamics in systems with a reduced dimension.