Giant piezomagnetic response driven by spin reorientation in the topological Kagome magnet TbMn6Sn6

Hanyang Qian; Wen Sun; Juntao Huo; Guowei Li

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arXiv · 2610.38528

Giant piezomagnetic response driven by spin reorientation in the topological Kagome magnet TbMn6Sn6

Hanyang Qian·Wen Sun·Juntao Huo·Guowei Li

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Abstract

Achieving a large strain response to a small magnetic-field variation remains a challenge in magnetomechanical materials, particularly in topological systems where the coupling between spin reconstruction and lattice deformation remains unclear. Here, we report an anomalous magnetostrictive response associated with field-induced spin reorientation in the topological Kagome magnet TbMn6Sn6. Below its spin-reorientation temperature of 310 K, an in-plane magnetic field induces an abrupt increase in magnetostriction, which exceeds 120 ppm at 240 K. This transition produces a giant differential piezomagnetic coefficient of approximately 5000 ppm T-1, far exceeding the values reported for other topological magnetic materials and commercial FeGa alloys, and placing TbMn6Sn6 among the most field-sensitive magnetostrictive materials. The field position of this peak agrees with the anomalies in magnetization and magnetotransport, demonstrating that the large differential response is tied to field-induced spin reorientation. Thermal expansion also changes across the spin-reorientation boundary. Raman measurements reveal corresponding anomalies in phonon energy and linewidth, indicating that the reorientation modifies the lattice dynamics. The combined results support a mechanism in which competing magnetic anisotropies of the Tb and Mn sublattices, coupled through Tb-Mn exchange, create magnetic configurations with different equilibrium strains. This finding establishes spin reorientation as a route to giant piezomagnetic responses in topological magnets and provides a basis for magnetomechanical sensing and switching near room temperature.

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Hanyang Qian, Wen Sun, Juntao Huo, Guowei Li. 2026-10-28. Giant piezomagnetic response driven by spin reorientation in the topological Kagome magnet TbMn6Sn6. https://arxiv.org/abs/2610.38528

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