Strain-Driven Altermagnetic Spin-Splitting Effect in RuO<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 42312477.
- Also identified by DOI 10.1021/acs.nanolett.6c00768.
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Abstract
The non-relativistic spin-momentum locking in altermagnets gives rise to a time-reversal-odd spin Hall effect, known as the altermagnetic spin-splitting effect (ASSE). Although ASSE was first reported in RuO<sub>2</sub>, subsequent experiments have yielded inconsistent results, leaving its spin transport mechanism unclear. Here, we systematically investigate how strain, crystal orientation, and the Hubbard <i>U</i> parameter influence the magnetic ground state and spin Hall response of RuO<sub>2</sub>. Guided by recent experimental observations, we find that <i>U</i> is likely smaller than the value required to induce intrinsic magnetism, suggesting that bulk RuO<sub>2</sub> and (001)/(101) RuO<sub>2</sub> thin films grown on TiO<sub>2</sub> are non-magnetic in the absence of extrinsic effects. In contrast, (100) and (110) films exhibit strain-induced altermagnetic spin splitting, leading to a strong ASSE even without Hubbard <i>U</i> corrections. These results reconcile previous experimental discrepancies and provide design guidelines for RuO<sub>2</sub>-based spintronic devices.