Journal Article

FZJ-2026-03922

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Weak Ferromagnetism in Altermagnets from Alternating g -Tensor Anisotropy

Jo, D. (Corresponding author) ; Go, D.FZJ* ; Mokrousov, Y.FZJ* ; Oppeneer, P. M. ; Cheong, S.-W. ; Lee, H.-W.

2025
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.134.196703  doi:10.34734/FZJ-2026-03922

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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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. DFG project G:(GEPRIS)444844585 - Statische und dynamische Kopplung von Gitter- und magnetischen Eigenschaften in zweidimensionalen Materialien mit niedriger Symmetrie (B06) (444844585) (444844585)
3. DFG project G:(GEPRIS)437337265 - Spin+AFM-Dynamik: Antiferromagnetismus durch Drehimpulsströme und Gitterdynamik (A11) (437337265) (437337265)

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