Mesoporous bismuth ferrite with amplified magnetoelectric coupling and electric field-induced ferrimagnetism

Thomas E. Quickel, Laura T. Schelhas, Richard A. Farrell, Nikolay Petkov, Le Van H. and Sarah H. Tolbert ()
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Thomas E. Quickel: University of California at Los Angeles
Laura T. Schelhas: University of California at Los Angeles
Richard A. Farrell: University of California at Los Angeles
Nikolay Petkov: Electron Microscopy and Analysis Facility (EMAF) Tyndall National Institute, University College Cork, Dyke Parade, Maltings
Le Van H.: University of California at Los Angeles
Sarah H. Tolbert: University of California at Los Angeles

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Coupled ferromagnetic and ferroelectric materials, known as multiferroics, are an important class of materials that allow magnetism to be manipulated through the application of electric fields. Bismuth ferrite, BiFeO3, is the most-studied intrinsic magnetoelectric multiferroic because it maintains both ferroelectric and magnetic ordering to well above room temperature. Here we report the use of epitaxy-free wet chemical methods to create strained nanoporous BiFeO3. We find that the strained material shows large changes in saturation magnetization on application of an electric field, changing from 0.04 to 0.84 μb per Fe. For comparison, non-porous films produced using analogous methods change from just 0.002 to 0.01 μb per Fe on application of the same electric field. The results indicate that nanoscale architecture can complement strain-layer epitaxy as a tool to strain engineer magnetoelectric materials.

Date: 2015
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DOI: 10.1038/ncomms7562

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