Room-temperature multiferroic behavior in layer-structured Aurivillius phase ceramics

Applied Physics Letters - Tập 117 Số 5 - 2020
Zheng Li1,2,3,4,5,6,7, Vladimír Kovaľ8,2,3,4,5,6,9, Amit Mahajan8,1,3,4,5,6,10, Zhipeng Gao8,1,2,4,5,6,11, C. Vecchini8,1,2,3,5,6,12, Mark Stewart8,1,2,3,5,6,12, Markys G. Cain8,1,2,3,4,6,13, Kun Tao8,1,2,3,4,5,14, Chenglong Jia8,1,2,3,4,5,14, Giuseppe Viola8,1,3,4,5,6,10, Haixue Yan8,1,3,4,5,6,10
12Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Kosice 04001, Slovakia
23School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS, United Kingdom
34National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
45National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
56Electrosciences Ltd, Farnham, Surrey GU9 9QT, United Kingdom
67School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
7Gemological Institute, China University of Geosciences 1 , Wuhan 430074, China
81Gemological Institute, China University of Geosciences, Wuhan 430074, China
9Institute of Materials Research, Slovak Academy of Sciences 2 , Watsonova 47, Kosice 04001, Slovakia
10School of Engineering and Materials Science, Queen Mary, University of London 3 , London E1 4NS, United Kingdom
11National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics, China Academy of Engineering Physics 4 , Mianyang 621900, China
12National Physical Laboratory 5 , Hampton Road, Teddington TW11 0LW, United Kingdom
13Electrosciences Ltd 6 , Farnham, Surrey GU9 9QT, United Kingdom
14School of Physical Science and Technology, Lanzhou University 7 , Lanzhou 730000, China

Tóm tắt

Multiferroics that simultaneously exhibit ferroelectricity and ferromagnetism have recently attracted great attention due to their potential application in next generation electronic devices. However, only a few single-phase multiferroic materials exhibit ferroelectric and ferromagnetic orders at room temperature. Recently, some bismuth layer-structured Aurivillius compounds were reported as multiferroics at room temperature, but the origin of their magnetic property is still under debate because the net magnetization may originate from the presence of secondary phases that are not easily detected by laboratory XRD diffractometers. Here, textured Aurivillius phase Bi5.25La0.75FeCoTi3O18 ceramics were prepared by Spark Plasma Sintering. The ferromagnetic character of the ceramics was indicated by the magnetic field-induced reversible intensity changes of a certain set of crystalline planes belonging to the Aurivillius phase, as measured by in situ neutron diffraction under the applied magnetic field. The first principles calculations indicate that the ferromagnetism originates from double exchange interactions Fe3+–O–Fe3+, Co3+–O–Co3+, and Fe3+–O–Co3+ in the ferro-toroidal main phase. The magnetic-controlled ferroelectric domain switching was observed by piezoelectric force microscopy at room temperature. The prepared Aurivillius phase ceramics, with Co/Fe contributing to magnetization and polarization at the same time, can be considered an intrinsic room-temperature multiferroic.

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Applied Physics Letters

Tập 117 Số 5

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