Effect of Si doping on the electron spin resonance properties of ferrihydrite nanoparticles

被引：18

作者：

Seehra, MS ^{[1
]}

Punnoose, A ^{[1
]}

Roy, P ^{[1
]}

Manivannan, A ^{[1
]}

机构：

[1] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2001年 / 37卷 / 04期

关键词：

doped ferrihydrites; electron spin resonance; magnetometry; nanoparticles;

D O I：

10.1109/20.951125

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Electron spin resonance investigations at 9.24 GHz in Si-doped two-line ferrihydrite (Si/FeOOH . nH(2)O) nanoparticles of size similar or equal to 4 nm are reported for x = Si/(Si + Fe) = 0, 0.02, 0.05, 0.10 and 0.15. For all samples, a single broad resonance near g similar or equal to 2 is observed; however with increase in x, both the resonance field H-r and linewidth DeltaH increase but integrated intensity I of the line decreases, similar to the observed decrease in magnetization with x. These observations suggest that the observed resonance is due to uncompensated Fe3+ surface spins. Temperature variation (300 K to 80 K) of H-r and DeltaH for x = 0.05 shows a downward shift (deltaH(r)) of the line with a rapid increase in DeltaH so that deltaH(r) proportional to (DeltaH)(3) predicted for randomly oriented nanoparticles is observed.

引用

页码：2207 / 2209

页数：3

共 13 条

[1] EFFECT OF DIAMAGNETIC DOPING ON THE MAGNETIC-RESONANCE IN A QUASI-ONE-DIMENSIONAL SYSTEM TETRAMETHYLAMMONIUM MANGANESE TRICHLORIDE [J].