AC magnetic susceptibility measurement setups reveal dynamic responses of materials, suggesting insights into their properties.
AC magnetic susceptibility measurement is a fundamental characterization tool in materials science, to study the dynamic magnetic response of magnetic materials and superconductors. An AC multi-harmonic magnetometer is available at the LAMPS laboratory of the LNF-INFN. The magnetometer allows performing experiments with an AC driving magnetic field with variable amplitude from 0.1 to 20 Gauss and in the frequency range from 17 to 2070 Hz. A DC magnetic field 0-8 T produced by a superconducting magnet can be applied, while data may be collected in the temperature range 4.2-300 K using a liquid He cryostat. The first seven AC magnetic multi-harmonic susceptibility components can be measured with a magnetic sensitivity of 1x10-6 emu and a temperature precision of 0.01 K. Here we will describe in detail the magnetometer, the instrumental control and the data acquisition framework. Special attention will be dedicated to the user-friendly LabVIEW-based software platform that allows running the experiments.
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Di et al. (2013) studied this question.
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