Giant Non-Saturating Exchange Striction in a Noncollinear Antiferromagnet.
basic_science · Level V
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- Record sourced from PubMed, PMID 40099589.
- Also identified by DOI 10.1002/adma.202500829.
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Abstract
Magnetostriction, discovered by Joule in 1842, refers to the mechanical strain that a material undergoes in the presence of a magnetic field. Conventionally, it originates from the spin-orbit coupling and has been predominantly explored in ferromagnets. In this work, a giant magnetostriction effect is reported in the high-quality single crystal of a noncollinear antiferromagnet Mn<sub>3</sub>Sn. Non-saturating magnetostriction exceeding 400 ppm is obtained, which is even larger than the saturation values of the well-known Fe-based giant magnetostriction ferromagnetic materials such as FeGa. Theoretical calculations reveal that the large non-saturating magnetostriction results from a sophisticated exchange striction effect of the noncollinear antiferromagnetic spin structure, leading to a nearly linear dependence of the strain output on the applied magnetic field. This work provides an unprecedented strategy to design next-generation magnetoelastic materials with noncollinear compensated spin structures.