BROAD-BAND MEASUREMENT OF THE COMPLEX SUSCEPTIBILITY OF MAGNETIC FLUIDS

被引：9
作者：
FANNIN, PC [1 ]
CHARLES, SW [1 ]
RELIHAN, T [1 ]
机构：
[1] UNIV COLL N WALES, DEPT CHEM, BANGOR LL57 2UW, GWYNEDD, WALES
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 1993年 / 4卷 / 10期
关键词：
D O I：
10.1088/0957-0233/4/10/021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on the measurement, over the frequency range 10 Hz to 3 GHz, of the complex susceptibility, chi(omega) = chi'(omega) - ichi''(omega), of a magnetic fluid with manganese ferrite particles of median diameter 9.4 nm in a hydrocarbon carrier. This upper frequency was realized by use of a HP Network Analyser which operates over the frequency range 300 kHz to 3 GHz and has enabled a more complete susceptibility-frequency profile to be determined. The presence of a loss-peak at 30 MHz in the chi''(omega) component is a demonstration of the phenomenon of superparamagnetism in small ferromagnetic particles whilst the transition of chi'(omega) to a negative value at 65 MHz is indicative of ferroresonance.
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收藏
页码：1160 / 1162
页数：3
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