Radio-frequency impedance measurements using a tunnel-diode oscillator technique

被引：63

作者：

Srikanth, H ^{[1
]}

Wiggins, J ^{[1
]}

Rees, H ^{[1
]}

机构：

[1] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1999年 / 70卷 / 07期

关键词：

D O I：

10.1063/1.1149892

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A resonant method based on a tunnel-diode oscillator for precision measurements of relative impedance changes in materials is described. The system consists of an effective self-resonant LC tank circuit driven by a forward-biased tunnel diode operating in its negative resistance region. Samples under investigation are placed in the core of an inductive coil and impedance changes are determined directly from the measured shift in resonance frequency. A customized low temperature insert is used to integrate this experiment with a commercial Model 6000 Physical Property Measurement System (Quantum Design). Test measurements on a manganese-based perovskite sample exhibiting colossal magnetoresistance indicate that this method is well suited to study the magnetoimpedance in these materials. (C) 1999 American Institute of Physics. [S0034-6748(99)00607-3].

引用

页码：3097 / 3101

页数：5

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