Letter abstract


Nature Materials 6, 348 - 351 (2007)
Published online: 8 April 2007 | doi:10.1038/nmat1886

Subject Categories: Electronic materials | Magnetic materials

Giant sharp and persistent converse magnetoelectric effects in multiferroic epitaxial heterostructures

W. Eerenstein1,5, M. Wiora1,2,5, J. L. Prieto1,3, J. F. Scott4 & N. D. Mathur1

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Magnetoelectric coupling1, 2 between magnetic and electrical properties presents valuable degrees of freedom for applications. The two most promising scenarios are magnetic-field sensors3 that could replace low-temperature superconducting quantum interference devices, and electric-write magnetic-read memory devices that combine the best2 of ferroelectric and magnetic random-access memory. The former scenario requires magnetically induced continuous and reversible changes in electrical polarization. These are commonly observed, but the coupling constants thus obtained are invalid for data-storage applications, where the more difficult to achieve4, 5 and rarely studied magnetic response to an electric field is required. Here, we demonstrate electrically induced giant, sharp and persistent magnetic changes (up to 2.3times10-7 s m-1) at a single epitaxial interface in ferromagnetic 40 nm La0.67Sr0.33MnO3 films on 0.5 mm ferroelectric BaTiO3 substrates. X-ray diffraction confirms strain coupling via ferroelastic non-180° BaTiO3 domains. Our findings are valid over a wide range of temperatures including room temperature, and should inspire further study with single epitaxial interfaces.

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  1. University of Cambridge, Department of Materials Science, Pembroke Street, Cambridge CB2 3QZ, UK
  2. University of Applied Science Ulm, Faculty of Mechatronics, Albert-Einstein-Allee 55, 89081 Ulm, Germany
  3. Instituto de Sistemas Optoelectronicos y Microelectronica - E.T.S. Ing. Telecomunicaciones - UPM, Avd. Complutense s/n - 28040, Madrid, Spain
  4. University of Cambridge, Department of Earth Sciences, Downing Street, Cambridge CB2 3EQ, UK
  5. These authors contributed equally to this work

Correspondence to: N. D. Mathur1 e-mail: ndm12@cam.ac.uk

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