DynoMag 交流磁化量測同相異向磁化率

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

AC susceptometry (ACS) gives information on how fast magnetization is building up in a material. An excitation magnetic field is applied over the sample and the in-phase and out-of-phase susceptibility is measured in a frequency range. Different types of magnetization processes can be measured with ACS.

Cause

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 at room temperature. 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 a excitation field amplitude of 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 for instance bio-functionalizing of MNPs

• Follow the binding reactions of biomolecules to MNPs

• Measurement of magnetic properties in geophysics

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The DynoMag HF system

The DynoMag HF system is an AC susceptometer for measuring the dynamic magnetic properties of liquids, powders and solids at room temperature. 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 a excitation field amplitude of 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 properties in geophysics

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The Low Temperature High Frequency AC Susceptometer

In collaboration with Prof.?Sean Giblin’s research team at Cardiff University we have developed a low temperature high frequency (LTHF) ACS system integrated in a Quantum Design PPMs system. This makes it possible to carry out high frequency ACS sensing also at low temperatures and at high static magnetic fields (paper in Review of Scientific Instruments).

Method

Construction is carried out in our labs at RISE in G?teborg.

Deliveries

Delivery of the the DynoMag system or the DynoMag HF system including manual, calibration sample?and sample vials.