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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
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.
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.
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