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Low Voltage Induced Reversible Magnetoelectric Coupling in Fe3O4 Thin Films for Voltage Tunable Spintronic Devices

Abstract

The ongoing demands for efficient and low-energy consumption spintronic devices motivate the idea of manipulating magnetism by ionic liquid (IL) electrolyte gating at low voltage. Although magnetoelectric (ME) coupling has already been realized in some field-effect-transistor (FET) structures, some vital parameters such as giant ME coupling coefficient, excellent reversibility and low gating voltage seldom come at the same time, which greatly suppress the industrialization. Here we demonstrate a large 552 Oe spin dynamics modulation of Fe3O4 thin film induced at Vg= +1.5 V in an IL-gated Au/[DEME]+[TFSI]−/Fe3O4/MgO heterostructure with good reversibility up to 80 cycles, giving rise to a high magnetoelectric (ME) coefficient of 368 Oe/V. Such large ME tunability under low Vg could be attributed to the E-field induced ionic transformation between Fe2+ and Fe3+ at the interface. The tiny thickness change (~2 angstrom) and roughness change of Fe3O4 films under Vg= +1.5 V illustrated by in-situ XRR give a reasonable explanation on the outstanding reversible property. Interestingly, the Verwey transition temperature of Fe3O4 showed a strong dependence on Vg, revealing the potential of IL gating control of the intrinsic spin ordering inside magnetic films. This work drives forward the low-voltage induced reversible ME coupling to high-performance spintronic devices.

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Publication details

The article was received on 29 Jun 2018, accepted on 06 Aug 2018 and first published on 07 Aug 2018


Article type: Communication
DOI: 10.1039/C8MH00763B
Citation: Mater. Horiz., 2018, Accepted Manuscript
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    Low Voltage Induced Reversible Magnetoelectric Coupling in Fe3O4 Thin Films for Voltage Tunable Spintronic Devices

    L. Zhang, W. Hou, G. Dong, Z. Zhou, S. Zhao, Z. Hu, W. Ren, M. Chen, C. Nan, J. Ma, H. Zhou, W. Chen, Z.-G Ye, Z. Jiang and M. Liu, Mater. Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C8MH00763B

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