MAGNON Variable Field & Frequency Susceptibility Meter
The MAGNON VFSM is one of three susceptibility bridges at the IRM, along with a Geofyzika Brno (now AGICO) KLY-2 and an AGICO MFK1-FA. The least sensitive of the three, it has the advantages of (1) measuring susceptibility over a broad range of field amplitudes and frequencies; and (2) making rapid measurements.
Magnon VFSM
Designed by Horst Worm

Specifications:

  • Temperature range: room temperature
  • AC Field: 20 - 400 A/m
  • Frequency Range: 30 Hz - 10 kHz
  • Sensitivity: 10-5 - 10-7 (SI) depending on frequency, field, environment
  • Measurement Time: < 3 sec per measurement. 3-5 min per sample for range of frequencies and amplitudes

Measurement Types:

The MAGNON VFSM can aid in the characterization of fine-grained (superparamagnetic) magnetic populations through frequency-dependent measurements, as well as help identify some minerals (such as Fe-sulphides and titanomagnetites), which exhibit a field-dependence of susceptibility. The MAGNON VFSM measures both in- and out-of-phase components of susceptibility. It can accommodate cylinders and cubes with diameter < 35 mm.

Compare with

AGICO MFK1-FA with CS4 Furnace

The newest of our susceptibility bridges. More sensitive than the VSFM. Susceptibility can be measured at multiple fields and frequencies, but over a narrower range than the VSFM. It has an automatic rotator for making measurements of anisotropy, which are not possible on the VSFM. It has a furnace for measuring susceptibility with temperature

AGICO MFK1-FA

 

Geofyzika Brno KLY-2 with CS-2 Furnace

The oldest of the three susceptibility bridges. The applied field is set to one field and frequency. Its main function is to measure susceptibility-temperature curves. 

IRM KLY-2 Susceptibility Bridge
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