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Vibrating coil magnetometer for milli-Kelvin temperatures.
S Legl1, C Pfleiderer, K Krämer
1Physik-Department E21, Technische Universität München, D-85748 Garching, Germany.
The Review of Scientific Instruments
|May 6, 2010
Summary
We developed a vibrating coil magnetometer (VCM) for precise magnetization measurements at millikelvin temperatures. This system enables efficient cooling and fast data collection in uniform magnetic fields, achieving high sensitivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Low-Temperature Physics
Background:
- Accurate magnetization measurements are crucial for understanding magnetic materials.
- Existing techniques may face limitations at extremely low temperatures (millikelvin range).
Purpose of the Study:
- To develop and validate a novel vibrating coil magnetometer (VCM) integrated with a dilution refrigerator.
- To enable high-sensitivity magnetization measurements down to millikelvin temperatures.
Main Methods:
- Integration of a vibrating coil magnetometer (VCM) with a top-loading dilution refrigerator.
- Utilizing the VCM for measurements under uniform magnetic fields and studying magnetic anisotropies.
- Testing the system with the dipolar Ising magnet LiHoF(4).
Main Results:
- The developed VCM system demonstrates excellent long-term stability.
- Achieved high sensitivity exceeding 10(-4) emu.
- The system allows for efficient sample cooling and fast data acquisition across a wide magnetic field range.
Conclusions:
- The combined VCM and dilution refrigerator system is a powerful tool for low-temperature magnetic characterization.
- The system facilitates the study of magnetic properties, including anisotropies, at millikelvin temperatures.
- The developed magnetometer offers advantages in terms of speed, sensitivity, and sample handling.
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