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journal article·2019-12Open access

Reversible magnetoelectric switching in multiferroic three-dimensional nanocup heterostructure films

Hyunji An, Hyo Jin Hong, Yong-Ryun Jo, Soon-Gil Jung, Sangmo Kim, Sangwoo Kim, Jongmin Lee, Hojoong Choi, Hongji Yoon, So-Young Kim, Jaesun Song, Sang Yun Jeong, Byoung Hun Lee, Tae-Yeong Koo, Tuson Park, Kyung-Tae Ko, Bongjae Kim, Bong-Joong Kim, Chung Wung Bark, Sanghan Lee

NPG Asia Materials· Volume 11· Issue 1
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Abstract

Abstract Self-assembled nanocomposite films containing ferroelectric and ferromagnetic phases have attracted enormous research interest because they are the most promising candidates for practical multiferroic applications. However, obtaining a genuine magnetoelectric (ME) coupling effect is still challenging in this research area. To substantially improve the ME effect, new heterostructure designs with efficient strain control between two phases are urgently needed. Herein, a novel three-dimensional (3D) nanocup architecture of a heterostructure film is developed. To establish the unique architecture, a heavily Co, Fe-doped ferroelectric Bi3.25La0.75Ti3O12(BLT) target was used during the growth of BLT thin films via pulsed laser deposition. Consequently, 3D nanocup-structured CoFe2O4(CFO) particles formed inside the BLT via spontaneous nucleation and agglomeration. The 3D nanocup BLT-CFO film exhibited magnetically controlled reversible dielectric switching, which is direct evidence of strong ME coupling caused by the efficient interfacial strain coupling and low leakage of the novel nanocup architecture. The obtained results strongly suggest that the 3D nanocup heterostructure film significantly improves the ME coupling effect. In addition, we propose a new paradigm in the architecture design of self-assembled nanocomposite films for diverse multifunctional devices.
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Research context

NanomaterialsElectronic materialsMaterials processing

OpenAlex topics: Multiferroics and related materials · Ferroelectric and Piezoelectric Materials · Dielectric properties of ceramics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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