Year: 2022
Type: article
Abstract: According to previous theoretical work, the binary oxide CuO can become a room-temperature multiferroic via tuning of the superexchange interactions by application of pressure. Thus far, however, there has been no experimental evidence for the predicted room-temperature multiferroicity. Here, we show by neutron diffraction that the multiferroic phase in CuO reaches 295 K with the application of 18.5 GPa pressure. We also develop a spin Hamiltonian based on density functional theory and employing superexchange theory for the magnetic interactions, which can reproduce the experimental results. The present Letter provides a stimulus to develop room-temperature multiferroic materials by alternative methods based on existing low temperature compounds, such as epitaxial strain, for tunable multifunctional devices and memory applications.
Source: Physical Review Letters
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Funders: European Commission, Centre National de la Recherche Scientifique, ShanghaiTech University, Horizon 2020 Framework Programme, Engineering and Physical Sciences Research Council, Science and Technology Facilities Council, Japan Society for the Promotion of Science, National Institute for Materials Science, JST-Mirai Program, HORIZON EUROPE Marie Sklodowska-Curie Actions
Awards: Study of multiferroics by spherical neutron polarimetry analysis under high pressure, G434337789, TUneable Multiferroics based on oxygen OCtahedral Structures, G6321838744, Development of Hybrid Anvil Cell for polarized and unpolarized neutron diffraction experiment, G6951162430, G7205867687, Basic research for low-temperature heat pump by using all solid state cooling method
OpenAlex ID: W4309065713