AGM
Princeton Micromag/Lakeshore Cryotronics 2900 Series Alternating Gradient Magnetometer
PRIMARY USE
Material characterization and identification
The magnetic properties of a material depend on much more than just the elemental composition. Very similar materials, like the iron oxides that make up ochres, can still look quite different due to their magnetic properties.
SIMPLE STATS
Sample Size: 5x5x2mm, 0.1 - 200.0mg
Sensitivity (1 s Average): 10 nemu / 1e-9 Am^2/kg
Maximum Field: 1 T / 10,000 Oe
Two measuring positions for anistropic samples
PRIMARY MEASUREMENTS
Hysteresis Loop
Backfield Curve
FORC, First Order Reversal Curve
PRIMARY MEASUREMENTS
Hysteresis is the ability of ferromagnetic materials to "remember" an applied field. Hysteresis loops interrogate this "memory" by measuring the magnetization of a sample in response to an external changing magnetic field (left). The gap in this loop represents the "memory". This is the primary method to identify the complete magnetic behavior of a material, but even more can be done to determine mineralogy.