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Research Article

Unveiling the role of Fe3O4 in polymer spin valve near Verwey transition

Shuaishuai Ding1,3, Yuan Tian3,4( ), Xiang Liu2, Ye Zou3, Huanli Dong3, Wenbo Mi2( ), Wenping Hu1,3,5,6( )
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, China
Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
School of Physics and Electronics, Hunan University, Changsha 410082, China
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
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Abstract

The spinterface formed between ferromagnetic (FM) electrode and organic materials is vital for performance optimization in organic spin valve (OSV). Half-metallic Fe3O4 with drastic change in structure, conductivity and magnetic property near Verwey transition can serve as an intrinsic spinterface regulator. However, such modulating effect of Fe3O4 in OSV has not been comprehensively investigated, especially below the Verwey transition temperature (Tv). Here, we highlight the important role of Fe3O4 electrode in reliable-working and controllable Fe3O4/P3HT/Co polymer spin valves by investigating the magnetoresistance (MR) above and below Tv. In order to distinguish between different contributions to charge transport and related MR responses, the systematic electronic and magnetic characterizations were carried out in full temperature range. Particularly, the first-order metal-insulator transition in Fe3O4 has a dramatic effect on the MR enhancement of polymer spin valves at Tv. Moreover, both the conducting mode transformation and MR line shape modulation could be accomplished across Tv. This research renders unique scenario to multimodal storage by external thermodynamic parameters, and further reveals the importance of spin-dependent interfacial modification in polymer spin valves.

Keywords

polymer spin valvesFe3O4Verwey transitionmagnetoresistance

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Nano Research
Volume 14 Issue 1,
January 2021
Pages 304-310
DOI: 10.1007/s12274-020-3089-x
Cite this article:
Ding S, Tian Y, Liu X, et al. Unveiling the role of Fe3O4 in polymer spin valve near Verwey transition. Nano Research, 2021, 14(1): 304-310. https://doi.org/10.1007/s12274-020-3089-x
Topics:
ElectrodesIron oxidesSemiconductor insulator boundaries

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Received: 23 June 2020
Revised: 03 September 2020
Accepted: 03 September 2020
Published: 05 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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