Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO3 Thin Films
| Autor: | Manjula I. Nandasiri, Tamas Varga, Scott A. Chambers, Dehong Hu, Bumsoo Kim, Libor Kovarik, Seungbum Hong, Yulan Li, Seokwoo Jeon, Timothy C. Droubay, Vaithiyalingam Shutthanandan |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Condensed matter physics Magnetic circular dichroism 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) Epitaxy 01 natural sciences Ferroelectricity Condensed Matter::Materials Science Transition metal Ferromagnetism 0103 physical sciences General Materials Science Multiferroics Thin film 010306 general physics 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 9:21879-21890 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.7b04481 |
| Popis: | Polarization-induced weak ferromagnetism (WFM) was demonstrated a few years back in LiNbO3-type compounds, MTiO3 (M = Fe, Mn, Ni). Although the coexistence of ferroelectric polarization and ferromagnetism has been demonstrated in this rare multiferroic family before, first in bulk FeTiO3, then in thin-film NiTiO3, the coupling of the two order parameters has not been confirmed. Here, we report the stabilization of polar, ferromagnetic NiTiO3 by oxide epitaxy on a LiNbO3 substrate utilizing tensile strain and demonstrate the theoretically predicted coupling between its polarization and ferromagnetism by X-ray magnetic circular dichroism under applied fields. The experimentally observed direction of ferroic ordering in the film is supported by simulations using the phase-field approach. Our work validates symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and WFM in MTiO3 transition metal titanates crystallizing in the LiNbO3 structure. It also demonstrates the ... |
| Databáze: | OpenAIRE |
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