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

被引：14

作者：

Bordonali, L. ^{[1
,2
,3
,4
]}

Furukawa, Y. ^{[3
,4
]}

Kraken, M. ^{[5
]}

Litterst, F. J. ^{[5
]}

Sangregorio, C. ^{[6
,7
]}

Casula, M. F. ^{[8
,9
]}

Lascialfari, A. ^{[2
,10
,11
]}

机构：

[1] Univ Uniroma TRE, Dept Phys E Amaldi, Rome, Italy

[2] Univ Pavia, Dept Phys A Volta, I-27100 Pavia, Italy

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[4] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[5] Tech Univ Carolo Wilhelmina Braunschweig, Inst Condensed Matter Phys, D-38106 Braunschweig, Germany

[6] Univ Florence, INSTM, I-50019 Sesto Fiorentino, Italy

[7] Univ Florence, Dept Chem U Schiff, I-50019 Sesto Fiorentino, Italy

[8] Univ Cagliari, INSTM, Cagliari, Italy

[9] Univ Cagliari, Dept Chem Sci, Cagliari, Italy

[10] Univ Milan, Dept Mol Sci Appl Biosyst, I-20134 Milan, Italy

[11] S3 CNR, Inst Neurosci, I-41125 Modena, Italy

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 17期

关键词：

NUCLEAR MAGNETIC RELAXATION; GAMMA-FE2O3; NANOPARTICLES; TEMPERATURE; SURFACE; SIZE;

D O I：

10.1103/PhysRevB.85.174426

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a broadband H-1-NMRstudy of the temperature spin dynamics of nearly monodisperse dextran-coated gamma-Fe2O3 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.

引用

页数：7

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