The AC multi-harmonic magnetic susceptibility measurement setup at the LNF-INFN

TL;DR

This paper describes the design and capabilities of the LAMPS laboratory's AC multi-harmonic magnetic susceptibility measurement setup, enabling detailed magnetic response analysis of materials across various conditions.

Contribution

It introduces a comprehensive AC multi-harmonic magnetometer with advanced control, data acquisition, and software, expanding experimental possibilities in magnetic materials research.

Findings

Measurement sensitivity of 1x10^-6 emu

Temperature control precision of 0.01 K

Frequency range up to 2070 Hz

Abstract

The AC magnetic susceptibility is a fundamental method in materials science, which allows to probe the dynamic magnetic response of magnetic materials and superconductors. The LAMPS laboratory at the Laboratori Nazionali di Frascati of the INFN hosts an AC multi-harmonic magnetometer that allows performing experiments with an AC magnetic field ranging from 0.1 to 20 Gauss and in the frequency range from 17 to 2070 Hz. A DC magnetic field from 0 to 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 under different temperature cycles setups. 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 about schematic of the magnetometer, special attention will be dedicated to the instruments control, data acquisition framework and the user-friendly LabVIEW-based software platform.