Radio-frequency impedance measurements using a tunnel-diode oscillator (TDO) technique
H. Srikanth(1), J. Wiggins, H. Rees (Advanced Materials Research, Institute, University of New Orleans, (1) Author to whom all correspondence, should be addressed)
TL;DR
This paper presents a precise, resonant tunnel-diode oscillator method for measuring relative impedance changes in materials, effectively integrating with existing systems and demonstrating its application on magneto-resistance materials.
Contribution
The paper introduces a novel TDO-based resonant technique for impedance measurement, compatible with low-temperature environments and capable of studying magneto-impedance in complex materials.
Findings
Effective impedance measurement via resonance frequency shift
Successful integration with physical property measurement systems
Application demonstrated on colossal magneto-resistance material
Abstract
A resonant method based on a tunnel-diode oscillator (TDO) 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 magneto-resistance (CMR) indicate that this method is well suited to study the magneto-impedance in these materials.
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