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

doi:10.1038/s41427-019-0172-4

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

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

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 Bi_3.25La_0.75Ti₃O₁₂ (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.

Original language	English
Article number	68
Journal	NPG Asia Materials
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41427-019-0172-4
State	Published - 1 Dec 2019

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An, H., Hong, H. J., Jo, Y. R., Jung, S. G., Kim, S., Kim, S., Lee, J., Choi, H., Yoon, H., Kim, S. Y., Song, J., Jeong, S. Y., Lee, B. H., Koo, T. Y., Park, T., Ko, K. T., Kim, B., Kim, B. J., Bark, C. W., & Lee, S. (2019). Reversible magnetoelectric switching in multiferroic three-dimensional nanocup heterostructure films. NPG Asia Materials, 11(1), Article 68. https://doi.org/10.1038/s41427-019-0172-4

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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.",

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

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AU - Jung, Soon Gil

AU - Kim, Sangmo

AU - Kim, Sangwoo

AU - Lee, Jongmin

AU - Choi, Hojoong

AU - Yoon, Hongji

AU - Kim, So Young

AU - Song, Jaesun

AU - Jeong, Sang Yun

AU - Lee, Byoung Hun

AU - Koo, Tae Yeong

AU - Park, Tuson

AU - Ko, Kyung Tae

AU - Kim, Bongjae

AU - Kim, Bong Joong

AU - Bark, Chung Wung

AU - Lee, Sanghan

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N2 - 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.

AB - 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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Reversible magnetoelectric switching in multiferroic three-dimensional nanocup heterostructure films

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