NMR of Nanosized Magnetic Systems, Ultrathin Films, and Granular Systems

Panissod, P.

doi:10.1002/9783527620548.ch8b

Cited by 2 publications

(1 citation statement)

References 74 publications

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“…3,[5][6][7] On the other hand, no attempt has been made so far to explore the local spin dynamics on a broad temperature range by NMR techniques, the actual papers in the literature being limited to NMR spectra of nuclei belonging to magnetic ions showing low-temperature spin freezing. 8 NMR has already been successfully employed for the study of the magnetic properties of molecular iron clusters, such as Fe 6 , 9 Fe 8 , 10,11 Fe 10 , 12 and Fe 30 , 13 where an enhancement in 1/T 1 at temperatures of 10-30 K revealed dynamics driven by the coupling of the paramagnetic ions with acoustic phonons. 14 The same intent is shared by the investigation of very small iron-based nanoparticles, taking the NMR research on iron complexes a step further on the scale of the spin-systems dimensions.…”

Section: Introductionmentioning

confidence: 99%

1H-NMR study of the spin dynamics of fine superparamagnetic nanoparticles

et al. 2012

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We report a broadband 1 H-NMR study of the temperature spin dynamics of nearly monodisperse dextran-coated γ -Fe 2 O 3 magnetic nanoparticles. We observed a maximum in T −1 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.

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