统一非共线反铁磁体中的磁、电和热电响应

中文摘要 AI 辅助

非共线反铁磁体通过其复杂的自旋构型和界面对称性，为控制磁、电和热电响应提供了非常规途径。在此，我们通过展示IrMn$_3$/Py异质结构中稳健且定量一致的交换偏置响应，探测了由非共线反铁磁体产生的特殊界面性质。该系统由10 nm厚的IrMn$_3$层与5 nm厚的坡莫合金（Py）薄膜耦合而成。纵向磁光克尔效应（MOKE）、各向异性磁电阻（AMR）和反常能斯特效应（ANE）测量独立地揭示了相同的约50 Oe的单向场偏移，以及一致的余弦角依赖关系。这些特征的同步观测确立了非共线反铁磁体所施加的界面磁对称性与相邻铁磁体响应之间的直接对应关系。这种对称性在磁化反转、电荷输运和热驱动电压产生中一致地体现，表明交换偏置印记不限于单一的可观测实验量。我们的结果揭示了IrMn$_3$/Py的协同多功能响应，并将交换偏置的传统理解扩展到共线反铁磁体系之外。更广泛地说，它们展示了非共线反铁磁体作为在自旋电子学和自旋热电子学器件中耦合磁、电和热电功能平台的潜力。

英文摘要

Non-collinear antiferromagnets offer unconventional routes for controlling magnetic, electrical, and thermoelectric responses through their complex spin configurations and interfacial symmetry. Here, we detect exceptional interfacial properties arising from a non-collinear antiferromagnet by demonstrating a robust and quantitatively consistent exchange-bias response in an IrMn$_3$/Py heterostructure. The system consists of a 10 nm IrMn$_3$ layer coupled to a 5 nm permalloy (Py) film. Longitudinal magneto-optical Kerr effect (MOKE), anisotropic magnetoresistance (AMR), and anomalous Nernst effect (ANE) measurements independently reveal the same unidirectional field shift of approximately 50 Oe, together with a consistent cosine angular dependence. The simultaneous observation of these signatures establishes a direct correspondence between the interfacial magnetic symmetry imposed by the non-collinear antiferromagnet and the responses of the adjacent ferromagnet. This symmetry is manifested consistently in magnetization reversal, charge transport, and thermally driven voltage generation, demonstrating that the exchange-bias imprint is not restricted to a single experimental observable. Our results reveal a coherent multifunctional response of IrMn$_3$/Py and extend the conventional understanding of exchange bias beyond collinear antiferromagnetic systems. More broadly, they demonstrate the potential of non-collinear antiferromagnets as platforms for coupling magnetic, electrical, and thermoelectric functionalities in spintronic and spin-caloritronic devices.

发表机构

• Universidade Federal Rural de Pernambuco（伯南布哥联邦农村大学）
• Universidade Federal de Pernambuco（伯南布哥联邦大学）

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