1H-NMR study of the spin dynamics of fine superparamagnetic nanoparticles
Journal Article
·
· Physical Review B
We report a broadband 1H-NMR study of the temperature spin dynamics of nearly monodisperse dextran-coated γ-Fe2O3 magnetic nanoparticles. We observed a maximum in T1−1(T) that decreases in amplitude and shifts toward higher temperatures with increasing field. We suggest that this is related to the progressive superparamagnetic spin blocking of the ferrite core. The data can be explained by assuming a single electronic spin-spin correlation time and introducing a field-dependent distribution of anisotropy energy barriers.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-07CH11358
- OSTI ID:
- 1045824
- Report Number(s):
- IS-J 7709
- Journal Information:
- Physical Review B, Vol. 85, Issue 17
- Country of Publication:
- United States
- Language:
- English
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