The DynoMag system and The High Frequency (HF) AC SUSCEPTOMETER

Image of DynoMag instrument

AC susceptometry

AC susceptometry give information on how fast magnetization is building up in a material. Different types of magnetization processes can be detected with AC susceptometry such as magnetization reversal in magnetic single domains (Néel relaxation), random rotation of particles containing thermally blocked single-domains (Brownian relaxation) and domain-wall motion that occur in poly-domain materials. All of these magnetization processes create a specific response in the AC susceptibility measurement. In the field of magnetic nanoparticles and AC susceptometry we have a large collaborate international network.

The DynoMag System

The DynoMag system is a portable easy to use AC susceptometer for measuring the dynamic magnetic properties of liquids, powders and solids. The excitation frequency range is from 1 Hz up to 500 kHz with a resolution in volume susceptibility 1·10-5 (SI units) at 1 kHz and field amplitude 0.5 mT.

Typical application areas:

  • AC susceptibility measurements of solids, powders and liquids
  • Dynamic magnetic analysis in the field of magnetic nanoparticles (MNPs)
  • Determine the size distribution of magnetic nanoparticles using an algorithm included in the software of the DynoMag (including both Brownian and  Néel relaxation)
  • Study stability and possible particle clustering during bio-functionalizing of MNP
  • Follow the binding reactions of biomolecules to MNP
  • Measurement of magnetic soil properties in geophysics

The DynoMag system has been developed at Swedish ICT Acreo – Sensor Systems since 2000 internally and in a EU FP6 project, Biodiagnostics. The Biodiagnostics project was a large collaborative project regarding using MNP and different types of magnetic detection principles. At Acreo we used changes in the dynamic magnetic response in order to sense binding activities of biomolecules.

Today we have sold internationally DynoMag systems to both academia and industry for mostly magnetic characterization of magnetic nanoparticles. We are also involved in a Vinnova financed project with the Ångström Laboratory in Uppsala in the field of bio-detection using magnetic nanoparticles and AC susceptometry.

The High Frequency (HF) AC Susceptometer

The HF AC susceptometer system is a AC susceptometer for measuring the dynamic magnetic properties of liquids, powders and solids. The excitation frequency range is from 25 kHz up to 10 MHz with a resolution in volume susceptibility 4.10-5 (SI units) at 100 kHz and field amplitude 30 µT.

Typical application areas:

  • AC susceptibility measurements of solids, powders and liquids at frequencies up to 10 MHz
  • Determine the size distribution of magnetic nanoparticles using an algorithm included in the software of the DynoMag (including both Brownian and  Néel relaxation)
  • Dynamic magnetic analysis in the field of magnetic nanoparticles (MNPs)
  • Detect the Néel relaxation of single-core particle systems
  • Measurement of magnetic soil properties in geophysics

 

The HF AC susceptometer system was developed at Swedish ICT Acreo – Sensor Systems since 2008 internally and in a EU FP7 project Nano3T. The Nano3T project was focused on studying and optimizing MNPs for magnetic hyperthermia. Together with the DynoMag system we are able to detect the dynamic magnetic properties of magnetic material in the frequency range from 1 Hz to 10 MHz, thus we cover mostly all of the interesting magnetic relaxations of magnetic nanoparticle systems.

 

Get a quotation

 

For further information, please contact:

Björn Samel, Sensor systems
bjorn.samel [at] acreo.se
+46 (0)70 475 00 81

Printed Materials

DynoMag (pdf)