Directed synthesis of a hybrid improper magnetoelectric multiferroic material

Tong Zhu, Fabio Orlandi, Pascal Manuel, Alexandra S. Gibbs, Weiguo Zhang, P. Shiv. Halasyamani and Michael A. Hayward ()
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Tong Zhu: University of Oxford, Inorganic Chemistry Laboratory
Fabio Orlandi: ISIS Facility, Rutherford Appleton Laboratory
Pascal Manuel: ISIS Facility, Rutherford Appleton Laboratory
Alexandra S. Gibbs: ISIS Facility, Rutherford Appleton Laboratory
Weiguo Zhang: University of Houston
P. Shiv. Halasyamani: University of Houston
Michael A. Hayward: University of Oxford, Inorganic Chemistry Laboratory

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Preparing materials which simultaneously exhibit spontaneous magnetic and electrical polarisations is challenging as the electronic features which are typically used to stabilise each of these two polarisations in materials are contradictory. Here we show that by performing low-temperature cation-exchange reactions on a hybrid improper ferroelectric material, Li2SrTa2O7, which adopts a polar structure due to a cooperative tilting of its constituent TaO6 octahedra rather than an electronically driven atom displacement, a paramagnetic polar phase, MnSrTa2O7, can be prepared. On cooling below 43 K the Mn2+ centres in MnSrTa2O7 adopt a canted antiferromagnetic state, with a small spontaneous magnetic moment. On further cooling to 38 K there is a further transition in which the size of the ferromagnetic moment increases coincident with a decrease in magnitude of the polar distortion, consistent with a coupling between the two polarisations.

Date: 2021
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DOI: 10.1038/s41467-021-25098-1

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