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Higher harmonics in planar Hall effect induced by cluster magnetic multipoles

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Title
Higher harmonics in planar Hall effect induced by cluster magnetic multipoles
Author(s)
Jeongkeun Song; Taekoo Oh; Eun Kyo Ko; Ji Hye Lee; Kim, Woo Jin; Zhu, Yangyu; Bohm-Jung Yang; Li, Yangyang; Tae Won Noh
Publication Date
2022-10
Journal
NATURE COMMUNICATIONS, v.13, no.1
Publisher
NATURE PORTFOLIO
Abstract
The lack of net magnetization in antiferromagnets makes them technologically promising, but it also makes detecting the spin orders challenging. Here, using electrical transport measurement, Song et al show how the planar Hall effect can detect different cluster magnetic multipoles in antiferromagnetic Nd2Ir2O7 film. Antiferromagnetic (AFM) materials are attracting tremendous attention due to their spintronic applications and associated novel topological phenomena. However, detecting and identifying the spin configurations in AFM materials are quite challenging due to the absence of net magnetization. Herein, we report the practicality of utilizing the planar Hall effect (PHE) to detect and distinguish "cluster magnetic multipoles" in AFM Nd2Ir2O7 (NIO-227) fully strained films. By imposing compressive strain on the spin structure of NIO-227, we artificially induced cluster magnetic multipoles, namely dipoles and A(2)- and T-1-octupoles. Importantly, under magnetic field rotation, each magnetic multipole exhibits distinctive harmonics of the PHE oscillation. Moreover, the planar Hall conductivity has a nonlinear magnetic field dependence, which can be attributed to the magnetic response of the cluster magnetic octupoles. Our work provides a strategy for identifying cluster magnetic multipoles in AFM systems and would promote octupole-based AFM spintronics.
URI
https://pr.ibs.re.kr/handle/8788114/12636
DOI
10.1038/s41467-022-34189-6
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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