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Tunable Hidden Altermagnetic Spin Splitting in Layered Ruddlesden-Popper Oxides
Tongxie Zhang1, Linding Yuan2, James M Rondinelli2
1Department of Physics, Indiana University, Bloomington, Indiana 47405, United States.
Nano Letters
|February 10, 2026
Summary
Altermagnets, a new class of materials, show spin splitting useful for spintronics. Researchers found ways to control this splitting in oxides using electric fields and oxygen vacancies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnets (AMs) are collinear antiferromagnets with compensated magnetization but exhibit nonrelativistic spin splitting.
- AMs combine benefits of ferromagnets and conventional antiferromagnets, offering potential for advanced spintronic devices.
Purpose of the Study:
- Investigate the existence and control of altermagnetic spin splitting in layered Ruddlesden-Popper oxides.
- Explore strategies for making local spin splitting globally apparent and tunable for spintronic applications.
Main Methods:
- Symmetry analysis
- First-principles calculations
- Electric field effect application
- Oxygen stoichiometry engineering
Main Results:
- Altermagnetic spin splitting is found locally in layered Ruddlesden-Popper oxides but is hidden with an even number of perovskite layers.
- An electric field effect can make the local spin splitting globally apparent by breaking inversion symmetry.
- Oxygen vacancies enhance spin splitting, and apical oxygen vacancies induce an insulator-to-metal transition.
Conclusions:
- Layered Ruddlesden-Popper oxides can host altermagnetic properties.
- Electric fields and oxygen stoichiometry engineering are effective strategies for tuning altermagnetic behavior.
- This research expands the material platforms for AMs and provides pathways for antiferromagnetic spintronic device development.
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