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Phase-sensitive dynamic susceptibility setup for measurements in pulsed magnetic fields.
Lars Postulka1, Paul Eibisch1, Andreas Holzmann1
1Physics Institute, Goethe-University Frankfurt(M), SFB/TR49, D-60438 Frankfurt(M), Germany.
The Review of Scientific Instruments
|April 1, 2019
Summary
This study introduces a novel AC susceptometer for pulsed magnetic fields, enabling measurements of both in-phase and out-of-phase AC susceptibility. The new device achieves high sensitivity and can detect temperature changes, advancing magnetic property characterization.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- AC susceptibility (χAC) characterizes magnetic properties like ordering and relaxation.
- Standard methods are limited to low DC fields, hindering high-field studies.
- Measuring the out-of-phase component (χAC″) in pulsed fields is challenging.
Purpose of the Study:
- To develop an AC susceptometer for pulsed magnetic fields.
- To enable phase-sensitive measurement of both in-phase (χAC′) and out-of-phase (χAC″) susceptibility.
- To achieve high sensitivity for magnetic signal detection.
Main Methods:
- Designed and realized an AC susceptometer for pulsed magnetic fields.
- Operated the device at frequencies up to 47 kHz with a 1.5 mT oscillating amplitude.
- Achieved a magnetic signal resolution of 3.6 × 10⁻⁶ emu.
Main Results:
- Successfully measured both in-phase and out-of-phase AC susceptibility in pulsed magnetic fields.
- Demonstrated the capability to perform measurements before and after field pulses.
- Showcased detection of temperature changes induced by magnetic field variations.
Conclusions:
- The developed AC susceptometer extends magnetic characterization to high pulsed fields.
- The setup allows for comprehensive analysis of magnetization dynamics and thermal effects.
- Validated by measurements on the spin-1/2 system CuSO₄·5H₂O.
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