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Reversible Spin Splitting Effect in Altermagnetic RuO2 Thin Films
Hyeonjung Jung1, Gimok So2, Seunghyeon Noh1
1Department of Materials and Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
None:
Spin-dependent anisotropic Fermi surfaces in altermagnets can give rise to nonrelativistic spin-charge conversion, known as the altermagnetic spin splitting effect (ASSE). While several studies have reported the inverse ASSE (IASSE) in altermagnetic RuO2 thin films, its magnitude and sign relative to the spin Hall effect (SHE) remain controversial. Here, we demonstrate reversible IASSE in RuO2 thin films by controlling the Néel vector orientation and accounting for the anisotropic transport characteristic. Spin Seebeck measurements in CoFeB/RuO2 heterostructures reveal polarity reversal of the IASSE-induced spin charge conversion (SCC) upon Néel vector switching. This indicates that IASSE can either enhance or suppress SCC depending on the Néel orientation. These results provide compelling evidence for the symmetry-governed and directionally reversible nature of IASSE in RuO2.
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