Unifying Magnetic, Electrical, and Thermoelectric Responses in a Non-Collinear Antiferromagnet

André José; Adrielson Dias; Carlos Eduardo; Giovanna Celly; Luiza Paffer; José Araújo; José Laurentino; Monalisa Cavalcante; José Holanda

arXiv · 2609.33046

Unifying Magnetic, Electrical, and Thermoelectric Responses in a Non-Collinear Antiferromagnet

André José·Adrielson Dias·Carlos Eduardo·Giovanna Celly·Luiza Paffer·José Araújo·José Laurentino·Monalisa Cavalcante·José Holanda

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Abstract

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.

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André José, Adrielson Dias, Carlos Eduardo, Giovanna Celly, Luiza Paffer, José Araújo, José Laurentino, Monalisa Cavalcante, José Holanda. 2026-09-27. Unifying Magnetic, Electrical, and Thermoelectric Responses in a Non-Collinear Antiferromagnet. https://arxiv.org/abs/2609.33046

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