模型立方非共线交变磁体中的压磁效应
Piezomagnetism in a model cubic noncollinear altermagnet
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中文总结 AI 辅助
本研究在立方非共线交变磁体MnTe2中发现巨大压磁响应，通过膨胀测量与核磁共振证实直接和逆压磁效应，确立其为模型交变磁体，为自旋电子学与存储应用提供新途径。
中文摘要 AI 辅助
交变磁体构成了一类独特的磁性材料，它们将补偿磁序与自旋极化电子能带相结合，因此兼具反铁磁体和铁磁体的特性。压磁效应——晶格应变与净磁矩之间的线性关系——已成为区分交变磁性与反铁磁性的确凿证据。在此，我们在MnTe2中发现了巨大的压磁响应，这是一种具有非共线自旋排列和弱自旋轨道耦合的立方交变磁体。我们将膨胀测量法与核磁共振（一种体相局域探针）相结合，观察到了直接和逆压磁效应的特征，这些特征与对称性考虑和第一性原理计算一致。膨胀测量揭示了与外加磁场成正比的剪切形变，而磁共振则检测到由剪切应变感应的铁磁矩。压磁耦合强度的相应结果吻合良好，且被第一性原理结果所捕捉。这些关于简单二元MnTe2的发现将该材料定位为模型交变磁体，展示了核磁共振在压磁效应研究中的实用性，并为自旋电子学和存储应用中的多模态应变与磁场控制开辟了新途径。
英文摘要
Altermagnets constitute a distinct class of magnetic materials that combine compensated magnetic order with spin-polarized electronic bands, hence carrying characteristics of both antiferromagnets and ferromagnets. Piezomagnetism - the linear relationship between lattice strain and a net magnetic moment - has emerged as smoking-gun evidence of altermagnetism that distinguishes it from antiferromagnetism. Here, we uncover a large piezomagnetic response in MnTe2, a cubic altermagnet with a noncollinear spin arrangement and weak spin-orbit coupling. We combine dilatometry with nuclear magnetic resonance, a bulk local probe, to observe signatures of both direct and inverse piezomagnetism consistent with symmetry considerations and first-principles calculations. The dilatometry measurements reveal a shear deformation proportional to an applied magnetic field, while magnetic resonance detects a ferromagnetic moment induced by shear strain. The respective results for the piezomagnetic coupling strength are in good agreement, and they are captured by first-principles results. These findings for simple binary MnTe2 position this material as a model altermagnet, demonstrate the utility of nuclear magnetic resonance in investigations of piezomagnetism, and open new avenues for multimodal strain and magnetic-field control in spintronic and memory applications.
发表机构
- University of Minnesota（明尼苏达大学）
- University of Zagreb（萨格勒布大学）
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