DC Field Measurement Techniques
Below is a list of measurement techniques available at the DC Field Facility. For a list of all techniques available across all MagLab facilities, please go to our main Measurement Techniques page.
The DC Field Facility has the capability to measure low resistances samples in continuous fields up to 45 T. Most of the standard laboratory electronics that users have experience with for lower field measurements are available at the MagLab, including lock-in amplifiers, current sources and pre-amplifiers.
EPR and ESR are two names of the same technique (EPR is preferred by the chemists and biologists while ESR is a favorite of physicists) which depends on detecting transitions between the magnetic field-split spin sublevels in systems with unpaired electrons, in particular, in paramagnets.
Various pressure cells have been developed to address user needs, including large volume piston-cylinder cells with a maximum working pressure of 2.5 GPa and diamond anvil cells (DACs) that reach pressures greater than 20 GPa for optical measurements and 10 GPa for measurements that require introducing electrical leads.
Phase transitions that produce small length changes (even on the order of nanometers) due to thermal expansion or magnetostriction can be resolved by making contact between the tip of a miniature piezo-resistive cantilever and a sample.
In the pulse-echo ultrasonic technique, an ultrasound wave is excited and detected by two identical piezoelectric transducers (transmitter and receiver), which are glued to polished opposite sides of a sample.
In a Raman scattering experiment, a specimen is shined with laser light of a known frequency (energy) and polarization, and the scattered light is collected and analyzed for frequency and polarization.
The use of mechanical resonances to determine the elastic moduli of materials of interest to condensed matter physicists, engineers and materials scientists is steadily evolving. With the massive computing capability found in an ordinary personal computer, it is now possible to find all the elastic moduli of low-symmetry solids using sophisticated analysis of a set of the lowest resonances.
The contactless Surface Acoustic Wave (SAW) technique is implemented to probe the high-frequency conductivity in low dimensional (2D) structures, by measuring the SAW attenuation and velocity.
The Magneto-optical Kerr probe provides the laboratory with a unique apparatus to measure properties of ultra-thin magnetic films and multilayers at high magnetic fields and cryogenic temperatures (2K-325K).
A vibrating sample magnetometer (VSM) is used to measure DC magnetic susceptibility and DC magnetization. The VSM utilizes the Faraday’s Law to measure absolute magnetic moment of a magnetic sample.