Instruments




Superconducting Rock Magnetometer (U-channel Magnetometer)

A 2G Enterprises 755-1.65UC DC SQUID Superconducting Rock Magnetometer, installed in 1996, is available for automated measurements of U-channel and muliple discrete samples (up to 7 samples can be placed in the 150-cm-long discrete tray). Besides measuring remanences, this instrument has inline AF demagnetization, ARM, and IRM units.



(2G Enterprises Model 755-1.65UC)


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Superconducting Rock Magnetometer (Discrete Magnetometer)

A 2G Enterprises 760-3.0 AC SQUID Superconducting Rock Magnetometer, installed in 1986, is available for manual measurement of single discrete samples.

(2G Enterprises Model 760-3.0)

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Alternating Gradient Magnetometer (AGM) or MicroMag


Our Princeton MicroMag 2900 AGM is used for measuring magnetic properties of powders or very small pieces (typically a few milligrams to <100 mg) of rocks or man-made materials. The most common measurements are hysteresis loops, backfield, and first order reversal curves (FORCs).





The following two images show the MicroMag
inside the soundproof box designed by Alex Roth.





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Alternating Gradient Magnetometer/Vibrating Sample Magnetometer (AGM/VSM) with cryostat and furnace

Similar to the MicroMag 2900 described above, except this MicroMag (Princeton Measurements Corp. Model 3900) also has a VSM head and the magnetic properties of a sample can be measured at temperatures ranging from 10K up to 800°C. This instrument resides on the second floor in the Physics side of the Physics/Geology Building.



The VSM head is used for high temperatures. The sample is attached to the end of a vertical rod that vibrates (vertically) inside a fused silica dewar with a heating element and thermal couple. As shown below, the VSM head has an automated rotating mechanism, which allows the moment to be measured at any orientation in the horizontal plane.






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KappaBridge Susceptibility Meter with furnace





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Magnetic Property Measurement System (MPMS)

Quantum Designs MPMS2 cryogenic susceptometer

The MPMS is used primarily for magnetic mineral identification based on low-temperature crystallographic transitions (e.g. the Verwey transition in magnetite at about 110 K), and for characterizing particle size distributions, especially for samples containing ultrafine-grained superparamagnetic grains.

This instrument resides on the second floor in the Physics side of the Physics/Geology Building.

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Bartington Susceptibility Meters (discrete, probe, and loop)





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Thermal Demagnetizer




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Alternating Field Demagnetizer





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Impulse Magnetizer





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Schonstedt Spinner Magnetometer



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Molspin Spinner Magnetometer





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Fluxgate Magnetometer




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Other Equipment

In addition to the laboratory instruments, rock preparation facilities include two single blade rock saws, a thin blade rock saw for delicate samples, and a dual blade rock saw. Laps (polishing wheels) are also available for grinding or polishing rock samples.

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