Atomically engineered ferroic layers yield a room-temperature magnetoelectric multiferroic

Julia A. Mundy, Charles M. Brooks, Megan E. Holtz, Jarrett A. Moyer, Hena Das, Alejandro F. Rébola, John T. Heron, James D. Clarkson, Steven M. Disseler, Zhiqi Liu, Alan Farhan, Rainer Held, Robert Hovden, Elliot Padgett, Qingyun Mao, Hanjong Paik, Rajiv Misra, Lena F. Kourkoutis, Elke Arenholz, Andreas SchollJulie A. Borchers, William D. Ratcliff, Ramamoorthy Ramesh, Craig J. Fennie, Peter Schiffer, David A. Muller, Darrell G. Schlom

Research output: Contribution to journalArticle

Abstract

Materials that exhibit simultaneous order in their electric and magnetic ground states hold promise for use in next-generation memory devices in which electric fields control magnetism. Such materials are exceedingly rare, however, owing to competing requirements for displacive ferroelectricity and magnetism. Despite the recent identification of several new multiferroic materials and magnetoelectric coupling mechanisms, known single-phase multiferroics remain limited by antiferromagnetic or weak ferromagnetic alignments, by a lack of coupling between the order parameters, or by having properties that emerge only well below room temperature, precluding device applications. Here we present a methodology for constructing single-phase multiferroic materials in which ferroelectricity and strong magnetic ordering are coupled near room temperature. Starting with hexagonal LuFeO 3 - the geometric ferroelectric with the greatest known planar rumpling - we introduce individual monolayers of FeO during growth to construct formula-unit-thick syntactic layers of ferrimagnetic LuFe 2 O 4 (refs 17, 18) within the LuFeO 3 matrix, that is, (LuFeO 3) m /(LuFe 2 O 4) 1 superlattices. The severe rumpling imposed by the neighbouring LuFeO 3 drives the ferrimagnetic LuFe 2 O 4 into a simultaneously ferroelectric state, while also reducing the LuFe 2 O 4 spin frustration. This increases the magnetic transition temperature substantially - from 240 kelvin for LuFe 2 O 4 (ref. 18) to 281 kelvin for (LuFeO 3) 9 /(LuFe 2 O 4) 1. Moreover, the ferroelectric order couples to the ferrimagnetism, enabling direct electric-field control of magnetism at 200 kelvin. Our results demonstrate a design methodology for creating higher-temperature magnetoelectric multiferroics by exploiting a combination of geometric frustration, lattice distortions and epitaxial engineering.

Original languageEnglish (US)
Pages (from-to)523-527
Number of pages5
JournalNature
Volume537
Issue number7621
DOIs
StatePublished - Sep 21 2016

ASJC Scopus subject areas

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    Mundy, J. A., Brooks, C. M., Holtz, M. E., Moyer, J. A., Das, H., Rébola, A. F., Heron, J. T., Clarkson, J. D., Disseler, S. M., Liu, Z., Farhan, A., Held, R., Hovden, R., Padgett, E., Mao, Q., Paik, H., Misra, R., Kourkoutis, L. F., Arenholz, E., ... Schlom, D. G. (2016). Atomically engineered ferroic layers yield a room-temperature magnetoelectric multiferroic. Nature, 537(7621), 523-527. https://doi.org/10.1038/nature19343