3 years ago

Room-Temperature Multiferroics and Thermal Conductivity of 0.85BiFe1–2xTixMgxO3–0.15CaTiO3 Epitaxial Thin Films (x = 0.1 and 0.2)

Room-Temperature Multiferroics and Thermal Conductivity of 0.85BiFe1–2xTixMgxO3–0.15CaTiO3 Epitaxial Thin Films (x = 0.1 and 0.2)
Ming-Hui Lu, Guo-Liang Yuan, Ji Zhang, Wei Sun, Xue-Jun Yan, Jiangtao Zhao, Zheng-Bin Gu, Yanbin Chen, Zhen-Lin Luo, Ke Wang, Lei Sun, Shan-Tao Zhang, Lei Li
Thin films of 0.85BiFe1–2xTixMgxO3–0.15CaTiO3 (x = 0.1 and 0.2, abbreviated to C-1 and C-2, respectively) have been fabricated on (001) SrTiO3 substrate with and without a conductive La0.7Sr0.3MnO3 buffer layer. The X-ray θ–2θ and ϕ scans, atomic force microscopy, and cross-sectional transmission electron microscopy confirm the (001) epitaxial nature of the thin films with very high growth quality. Both the C-1 and C-2 thin films show well-shaped magnetization–magnetic field hysteresis at room temperature, with enhanced switchable magnetization values of 145.3 and 42.5 emu/cm3, respectively. The polarization–electric loops and piezoresponse force microscopy measurements confirm the room-temperature ferroelectric nature of both films. However, the C-1 films illustrate a relatively weak ferroelectric behavior and the poled states are easy to relax, whereas the C-2 films show a relatively better ferroelectric behavior with stable poled states. More interestingly, the room-temperature thermal conductivity of C-1 and C-2 films are measured to be 1.10 and 0.77 W/(m·K), respectively. These self-consistent multiferroic properties and thermal conductivities are discussed by considering the composition-dependent content and migration of Fe-induced electrons and/or charged point defects. This study not only provides multifunctional materials with excellent room-temperature magnetic, ferroelectric, and thermal conductivity properties but may also stimulate further work to develop BiFeO3-based materials with unusual multifunctional properties.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b06961

DOI: 10.1021/acsami.7b06961

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.