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Tunneling magnetoresistance in altermagnetic RuO$_2$-based magnetic tunnel junctions

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arxiv 2502.13599 v1 pith:XOL74MCP submitted 2025-02-19 cond-mat.mtrl-sci

Seunghyeon Noh , Gye-Hyeon Kim , Jiyeon Lee , Hyeonjung Jung , Uihyeon Seo , Gimok So , Jaebyeong Lee , Seunghyun Lee
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Miju Park Seungmin Yang Yoon Seok Oh Hosub Jin Changhee Sohn Jung-Woo Yoo
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classification cond-mat.mtrl-sci
keywords altermagneticanisotropiccharacteristicsjunctionsmagneticmagnetoresistanceresultstunnel
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abstract

Altermagnets exhibit characteristics akin to antiferromagnets, with spin-split anisotropic bands in momentum space. RuO$_2$ has been considered as a prototype altermagnet; however, recent reports have questioned altermagnetic ground state in this material. In this study, we provide direct experimental evidence of altermagnetic characteristics in RuO$_2$ films by demonstrating spin-dependent tunneling magnetoresistance (TMR) in RuO$_2$-based magnetic tunnel junctions. Our results show the spin-splitted anisotropic band structure of RuO$_2$, with the observed TMR determined by the direction of the N\'eel vector of RuO$_2$. These results reflect the altermagnetic nature of RuO$_2$ and highlight its potential for spintronic applications, leveraging the combined strengths of ferromagnetic and antiferromagnetic systems.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. G-type Antiferromagnetic BiFeO$_3$ is a Multiferroic $g$-wave Altermagnet

    cond-mat.mtrl-sci 2025-05 conditional novelty 6.0 of 10

    G-type antiferromagnetic BiFeO3 is classified as a bulk g-wave altermagnet with spin splitting up to about 0.2 eV, using a completed group-theory table for (d,g,i)-wave altermagnets.

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