Two coil sets are used to measure the AC magnetic susceptibility, one to apply the oscillating magnetic field (primary or excitation coil) and the other to measure the induced voltage (secondary or pick-up (sensing) coil). The induced voltage is proportional to the change of the time varying magnetic moment (Faraday’s law) and the AC magnetic field frequency and amplitude (typically 1 Hz ~ 1 kHz and 0.1 ~ 10 Oe). The AC magnetic susceptibility can be used as a complimentary method to DC magnetic measurement techniques and also to study magnetic relaxation.
Images & Sample Data
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A schematic diagram of a typical AC-susceptometer coils.
A schematic diagram of a typical AC-susceptometer coils.
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Spin glass transition, Ho2Ge2O7 spin ice. (Click image for details.)
Spin glass transition, Ho2Ge2O7 spin ice. (Click image for details.)
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Ferromagnetic transition of Yb2Ti2O7 (Click image for details.)
Ferromagnetic transition of Yb2Ti2O7 (Click image for details.)
https://nationalmaglab.org/user-facilities/dc-field/dcfield-techniques/ac-magnetic-susceptibility-dc#sigProId985912a470
Instrumentation
Resistive Magnets
Superconducting Magnets
- AC/DC current calibrator (Valhalla model 2500)
- Current source (Keithely 6221)
- Lock-in amplifier
Related Publications
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