期刊
NANO LETTERS
卷 14, 期 11, 页码 6061-6065出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5031375
关键词
Bismuth ferrite; nanoparticles; multiferroic; Mossbauer spectroscopy; long-range ordering; anharmonic spin structure
类别
资金
- DFG [SPP 1681, WE2623/7-1, FOR 1509, Lu729/12]
- Stiftung Mercator (MERCUR)
To study the effects of different temperatures and particle sizes on the anharmonic cycloidal spin structure in BiFeO3 nanoparticles, Mossbauer spectroscopy was applied to three sets of particles with different mean diameters in the range of 54 nm to 1.6 mu m at temperatures between 4.2 and 800 K. The paramagnetic transition showed a distinct broadening upon decreasing particle size with Neel temperatures decreasing from 652 to 631 K. The anharmonicity of the long-range cycloidal structure, calculated from experimental Mossbauer spectra, is revealed to decrease upon rising temperature, starting at 150200 K and reaching the harmonic state at about 400 K.
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