| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1802033 | Journal of Magnetism and Magnetic Materials | 2009 | 5 Pages |
Abstract
The identification by 57Fe internal field nuclear magnetic resonance (NMR) of hyperfine fields at four Fe sites in the (average) tetragonal unit cell of vacancy-ordered γ-Fe2O3 (maghemite) is reported. The effects of vacancy redistribution due to annealing the partially vacancy-ordered form has been observed in the 57Fe lineshape. In addition, the reduction of the particle size of the vacancy-ordered form has been observed to gradually eliminate the vacancy ordering and then to cause a transition from ferrimagnetism to superparamagnetism.
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Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
T.J. Bastow, A. Trinchi, M.R. Hill, R. Harris, T.H. Muster,