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Related Experiment Video

Updated: Jun 19, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

Strain-Driven Altermagnetic Spin-Splitting Effect in RuO₂.

Seungjun Lee^1,2, Seung Gyo Jeong³, Jian-Ping Wang^2,3,4

¹Department of Applied Physics, Kyung Hee University, Yongin 17104, Republic of Korea.

|June 18, 2026

Summary

This summary is machine-generated.

Altermagnetic spin-splitting effect (ASSE) in RuO2 is strain-dependent. Specific crystal orientations show ASSE without strong electronic correlations, clarifying spin transport mechanisms for spintronic devices.

Keywords:

Hubbard U correction RuO2 altermagnetism density functional theory spin Hall effect strain

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Altermagnets exhibit unique spin-momentum locking, leading to the altermagnetic spin-splitting effect (ASSE), a time-reversal-odd spin Hall effect.
Experimental results for ASSE in Ruthenium Dioxide (RuO2) have been inconsistent, necessitating clarification of its underlying spin transport mechanisms.

Purpose of the Study:

To systematically investigate the influence of strain, crystal orientation, and Hubbard U parameter on the magnetic ground state and spin Hall response of RuO2.
To reconcile discrepancies in previous experimental findings regarding ASSE in RuO2.
To provide design guidelines for RuO2-based spintronic devices.

Main Methods:

First-principles calculations were employed to study the electronic structure and spin transport properties of RuO2 under varying conditions.
Systematic investigation of the effects of strain, crystal orientation, and the Hubbard U parameter on magnetic properties.
Analysis of spin Hall conductivity and related phenomena.

Main Results:

The Hubbard U parameter in bulk RuO2 and (001)/(101) thin films is likely insufficient to induce intrinsic magnetism.
Strain-induced altermagnetic spin splitting is observed in (100) and (110) RuO2 thin films.
A strong ASSE is achieved in specific strained RuO2 films even without significant Hubbard U corrections.

Conclusions:

The study reconciles conflicting experimental data on ASSE in RuO2 by highlighting the crucial role of strain and crystal orientation.
Strain engineering emerges as a key factor for realizing ASSE in RuO2, independent of strong electronic correlations.
The findings offer practical guidance for the development of novel RuO2-based spintronic applications.