NMR-D study of the local spin dynamics and magnetic anisotropy in different nearly monodispersed ferrite nanoparticles

被引：28

作者：

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

Kalaivani, T. ^{[4
,5
,6
]}

Sabareesh, K. P. V. ^{[2
,3
,4
,5
,6
]}

Innocenti, C. ^{[7
,8
]}

Fantechi, E. ^{[7
,8
]}

Sangregorio, C. ^{[7
,8
,9
]}

Casula, M. F. ^{[10
,11
]}

Lartigue, L. ^{[12
]}

Larionova, J. ^{[12
]}

Guari, Y. ^{[12
]}

Corti, M. ^{[2
,3
,6
]}

Arosio, P. ^{[2
,3
,4
,5
]}

Lascialfari, A. ^{[2
,3
,4
,5
,6
]}

机构：

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

[2] Univ Pavia, INSTM, I-27100 Pavia, Italy

[3] Univ Pavia, Dept Phys, I-27100 Pavia, Italy

[4] Univ Milan, INSTM, I-20134 Milan, Italy

[5] Univ Milan, Dept Phys, I-20134 Milan, Italy

[6] S3 CNR, Inst Nanosci, I-41125 Modena, Italy

[7] Univ Florence, INSTM, I-50019 Florence, Italy

[8] Univ Florence, Dept Chem U Schiff, I-50019 Florence, Italy

[9] CNR ISTM, I-20133 Milan, Italy

[10] Univ Cagliari, INSTM, I-09042 Cagliari, Italy

[11] Univ Cagliari, Dept Chem Sci, I-09042 Cagliari, Italy

[12] Univ Montpellier 2, Inst Charles Gerhardt Montpellier, CNRS, UMR Chim Mol & Org Solide 5253,UM2, F-34095 Montpellier 5, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 06期

基金：

欧盟第七框架计划;

关键词：

IRON-OXIDE NANOPARTICLES; CONTRAST AGENTS; RELAXATION; HYPERTHERMIA; MRI; LAW;

D O I：

10.1088/0953-8984/25/6/066008

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 [凝聚态物理];

摘要：

We present a systematic experimental comparison of the superparamagnetic relaxation time constants obtained by means of dynamic magnetic measurements and H-1-NMR relaxometry, on ferrite-based nanosystems with different composition, various core sizes and dispersed in different solvents. The application of a heuristic model for the relaxivity allowed a comparison between the reversal time of magnetization as seen by NMR and the results from the AC susceptibility experiments, and an estimation of fundamental microscopic properties. A good agreement between the NMR and AC results was found when fitting the AC data to a Vogel-Fulcher law. Key parameters obtained from the model have been exploited to evaluate the impact of the contribution from magnetic anisotropy to the relaxivity curves and estimate the minimum approach distance of the bulk solvent.

引用

页数：9

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