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Earth Magnetism Laboratory

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Earth Magnetism Laboratory


Recently installed.
2G Enterprises High-Resolution Superconducting Quantum Interference Device (SQUID) Rock Magnetometer.The magnetometer is located inside a Lodestar Magnetics magnetostatic shield attenuating the ambient magnetic field to <300 nT throughout a walk-in working space (a shielded room).

2G Enterprises 760-R three-axis Superconducting Quantum Interference Device (SQUID) Rock Magnetometer with in-line AF demagnetization system and automated sampling handling. The magnetometer is also equipped with an anhysteritic remanent magnetization (ARM) axial magnetizer and an isothermal remanent magnetization (IRM) pulse magnetizer. The magnetometer is located inside a Lodestar Magnetics magnetostatic shield attenuating the ambient magnetic field to <300 nT throughout a walk-in working space (a shielded room).

ASC Model TD-48SC thermal specimen demagnetizer features three-layered shielding for effective internal field nullification and a compact sample chamber for minimal thermal gradients in the sample region. An additional fully enclosed sample chamber with gas ports allows optional treatment in a non-oxidizing atmosphere. The controlled field coil allows heating and cooling the samples in a homogeneous magnetic field up to 1 mT (10 Oe) to impart a partial or full thermal remanent magnetization for paleointensity determination experiments. The EML has two TD-48SC demagnetizers.

Princeton Measurement Corporation Model 2900 Alternating Gradient Field Magnetometer (AGFM). This powerful system for measuring the magnetic properties of a vast range of materials has extremely high sensitivity (10 nemu rms) and speed of measurement (100 ms per point). The maximum applied field is 1.5 Tesla. The properties measured include full and partial magnetic hysteresis loops, first-order reversal curves (FORC), backfield demagnetization curves, isothermal remanent magnetization (IRM) acquisition curves, etc. The AGFM also allows measurement of magnetic parameters as a function of time. The AGFMs MicroMag software allows separation of ferromagnetic, paramagnetic, and diamagnetic components, among many other functions.

AGICO (Advanced Geoscience Instruments Company) MFK1-FA Kappabridge equipped with a CS-3 Furnace Apparatus and a CS-L Cryostat. The MFK1-FA Kappabridge is the most sensitive (10-8 SI) commercially available system for measuring bulk susceptibility in weak variable magnetic fields, operating at three different frequencies. The instrument also features rapid automatic measurement of the anisotropy of magnetic susceptibility. Utilization of the furnace and cryostat allows the measurement of temperature variation of bulk susceptibility within a broad temperature range from -196C to 700C, in air or flowing argon atmospheres.

Our other instruments are an Applied Physics System Model 520 Three-Axis Fluxgate Magnetometer, a Sapphire Instruments SI-4 AF Demagnetizer with ARM option, a Sapphire Instruments SI-6 Pulse Magnetizer capable of 1100 mT peak induction. Our Princeton Applied Research vibrating sample magnetometer with Edwards high vacuum system and Alpha 10 kilogauss electromagnet has been recently relocated to the Material Science Building.

The EML paleomagnetic field sampling equipment includes:
  • Portable rock drills;
  • Sun, magnetic and GPS orientation devices;
  • An ASC dual blade rock saw for paleomagnetic specimen preparation;
  • An ultrasonic cleaner;
  • An LDJ electronic gaussmeter;
  • Miscellaneous mu-metal chambers for sample storage;
  • Optical and petrological microscopes.
The Department of GMES houses a rock preparation room with equipment for rock cutting and polishing, mineral separation, and drilling core samples from hand samples.