Magnetic characterization lab

Frederiksborgvej 399, 4000 Roskilde

Key Details

  • Status Operational
  • Availability Commercial
  • FacilitySee facilities below

Listing Description

In connection with our research in magnetocalorics and magnetic refrigeration we have facilities for characterizing permanent magnet assemblies, magnetocaloric materials, and evaluating the performance of active magnetic regenerators. Key facilities include

– 3D Hall probe for measurement the spatial distribution of magnet fields
– Direct measurement of the adiabatic temperature change of magnetocaloric materials, from –40 to 30 °C
– LakeShore 7407 vibrating sample magnetometer (VSM) for measuring the magnetization of magnetic materials as a function of temperature (–190 – 180 °C) and applied magnetic field (0-1.6 tesla). It can handle a large variety of sample masses and shapes.
– Differential scanning calorimeter (DSC) capable of measuring heat capacity as a function of temperature (–40-50 °C) and applied magnetic field (0-1.5 tesla). It uses very sensitive Peltier elements as heat flux sensors and high vacuum (10–10 bar) to give high sensitivity measurements. A planned update will enable the DSC to operate at fixed constant temperature (rather than scanning) while varying the magnetic field. This will enable direct measurements of the isentropic entropy change involved in the magnetocaloric effect.
– Single-blow setup for analyzing heat transfer and flow resistance properties of thermal regenerators. By combining this experiment with sophisticated numerical models the intrinsic heat transfer properties of thermal regenerators can be determined. This is very important for accurately predicting the performance of magnetic refrigeration devices.

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