DOE OSTI · 2566883
Weak Ferromagnetism in Altermagnets from Alternating 𝑔-Tensor Anisotropy
Abstract
Altermagnets are magnetic materials with antiferromagnetic spin ordering but exhibit ferromagnetic properties. Understanding the microscopic origin of the latter is a central problem. Ferromagnetlike properties such as the anomalous Hall effect are linked with weak ferromagnetism, whose microscopic origin in altermagnets remains unclear however. We show theoretically that the alternating 𝑔-tensor anisotropy in altermagnets can induce weak orbital ferromagnetism even when the Dzyaloshinskii-Moriya interaction is forbidden. We demonstrate this mechanism to explain weak ferromagnetism for both collinear and noncollinear spin altermagnets. Our findings provide new insights into the origin of weak ferromagnetism and suggest orbital-based ways for manipulating magnetic configurations in altermagnets.
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Jo, Daegeun [Uppsala University (Sweden)] (ORCID:0000000206554552), Go, Dongwook [Johannes Gutenberg University Mainz (Germany); Forschungszentrum Jülich and JARA (Germany)] (ORCID:0000000157403829), Mokrousov, Yuriy [Johannes Gutenberg University Mainz (Germany); Forschungszentrum Jülich and JARA (Germany)] (ORCID:0000000310722421), Oppeneer, Peter M. [Uppsala University (Sweden)] (ORCID:0000000290692631), Cheong, Sang-Wook [Rutgers University, Piscataway, NJ (United States)], Lee, Hyun-Woo [Pohang University of Science and Technology (Korea)] (ORCID:0000000216488093). 2025-05-16. Weak Ferromagnetism in Altermagnets from Alternating 𝑔-Tensor Anisotropy. https://doi.org/10.1103/physrevlett.134.196703
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