Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3683520
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Funding
- Natural Science Foundation of China [11074076, 60906046]
- Major State Basic Research Development Program of China [2011CB922200, 2007CB924901]
- Program of New Century Excellent Talents
- MOE [NCET-08-0192]
- Shanghai Municipal Commission of Science and Technology [10DJ1400201, 11520701300, 10SG28, 10ZR1409800]
- Shanghai Institutions of Higher Learning
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Lattice vibrations of highly a-axis oriented CoFe2O4 (CFO) films have been investigated by Raman scattering in the temperature range of 80-873 K. The five phonon modes T-1g(2), T-1g(3), E-g, A(1g)(1), A(1g)(2), and their evolutions can be uniquely distinguished. It was found that an electron transfer between Co2+ and Fe3+ cations occurs in octahedral sites at about 173 K. The structure disorder in the CFO films appears with increasing the temperature, which indicates the cation migration between tetrahedral and octahedral sites. The phenomena suggest the structural transformation trend from inverse spinel to normal spinel at the elevated temperatures. (C) 2012 American Institute of Physics. [doi:10.1063/1.3683520]
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