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Updated: Feb 22, 2026

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Electric-Field Tunable Anisotropic g-Factor Induced by Spin Pumping.

Jian Shao1,2, Matthias Kronseder3, Jianping Guo2,4

  • 1Sauvage Laboratory for Smart Materials, School of Integrated Circuit, Harbin Institute of Technology, Shenzhen 518055, China.

Nano Letters
|February 20, 2026
PubMed
Summary

Spin pumping modulates the Landé g-factor in ferromagnets, an effect previously lacking experimental proof. This study shows tunable g-factor anisotropy in a 2D electron gas system, opening new avenues for magnetic dynamics control.

Keywords:
2DEGLandé g-factorelectric-field control of magnetismspin pumpingspin−orbit interaction

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Area of Science:

  • Condensed Matter Physics
  • Spintronics

Background:

  • Spin pumping transfers spin angular momentum from a ferromagnet to an adjacent material.
  • Theoretical studies suggest spin pumping influences the Landé g-factor, but experimental evidence is scarce.

Purpose of the Study:

  • To experimentally demonstrate and investigate the effect of spin pumping on the Landé g-factor.
  • To explore the tunability of this effect using external electric fields in a two-dimensional electron gas (2DEG) system.

Main Methods:

  • Fabrication of a Py/AlOx/STO heterostructure to create a 2DEG with strong spin-orbit interaction.
  • Characterization of magnetic damping and Landé g-factor under varying conditions.
  • Application of external electric fields to tune the observed anisotropy.

Main Results:

  • Observed significant modulation of the Landé g-factor due to spin pumping.
  • Identified an anisotropic g-factor with 2-fold symmetry below the 2DEG onset temperature.
  • Demonstrated that the g-factor anisotropy is tunable with an external electric field.

Conclusions:

  • Spin pumping can significantly alter the Landé g-factor in 2DEG systems.
  • This effect offers a new method for controlling magnetization dynamics.
  • The findings open possibilities for spintronic device applications.