Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals

Sugata Ray, Yury V. Kolen'Ko, Kirill A. Kovnir, Oleg I. Lebedev, Stuart Turner, Tanushree Chakraborty, Rolf Erni, Tomoaki Watanabe, Gustaaf Van Tendeloo, Masahiro Yoshimura, Mitsuru Itoh

研究成果: Article

20 引文 斯高帕斯(Scopus)

摘要

Defect mediated high temperature ferromagnetism in oxide nanocrystallites is the central feature of this work. Here, we report the development of room temperature ferromagnetism in nanosized Co-doped barium titanate particles with a size of around 14nm, synthesized by a solvothermal drying method. A combination of x-ray diffraction with state-of-the-art electron microscopy techniques confirms the intrinsic doping of Co into BaTiO 3. The development of the room temperature ferromagnetism was tracked down to the different donor defects, namely hydroxyl groups at the oxygen site () and oxygen vacancies (), and their relative concentrations at the surface and the core of the nanocrystal, which could be controlled by post-synthesis drying and thermal treatments.

原文English
文章編號025702
期刊Nanotechnology
23
發行號2
DOIs
出版狀態Published - 2012 一月 20

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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    Ray, S., Kolen'Ko, Y. V., Kovnir, K. A., Lebedev, O. I., Turner, S., Chakraborty, T., Erni, R., Watanabe, T., Tendeloo, G. V., Yoshimura, M., & Itoh, M. (2012). Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals. Nanotechnology, 23(2), [025702]. https://doi.org/10.1088/0957-4484/23/2/025702