AC Magnetic Fields

AC Magnetics

AC magnetic measurement data supplements DC magnetic data associated with slope of the VSM generated Hysteresis loop. AC magnetic data reporting addresses magnetic “Susceptibility” and supplements the DC magnetics of Permeability reporting.

ARkival uses its assortment of designed and fabricated miniature coil probes for all AC magnetic measurements. The probes are used with AC Magnetometers, for measuring magnetic material properties.

Both AC and DC material property parameters add to identification/fingerprinting” of materials for their use in applicable magnetic applications.

AC Magnetic Field Measurements

ARkival Technology has developed a fast and accurate measurement means for measuring AC magnetic fields and their corresponding AC frequencies used in magnetic devices. Typically both precision Hall probe and Miniature Coil probe testing of AC field measurements are made with calibrated accuracy referenced to standardized reference materials. AC Field measurements can be performed in either different dimensional views at small measurement location(s) or over larger areal regions of interest using either precision manual testing or automated robotic testing, both with and without magnetic field mapping. Eddy Current measurements are also possible.

AC Measurement Data

In AC magnetic measurements, where an AC field is applied to a sample and the AC magnetic moments measured, that data is an important tool for characterizing magnetic materials. Because the induced sample’s magnetic  moment is time-dependent in the AC tests; the additional information about the AC magnetization dynamics supplements DC measurements.

ARkival’s focus on the accurate measurement of AC material properties uses precision magnetometers that typically limits the material sample size to “small” rather than “large” . In many cases, test samples must be prepared for analysis and sample preparation options are discussed with clients prior to measurement.

Basic physical properties from the AC data are

• Resistivity,
• Critical temperatures,
• Critical current density,
• Frequency response

Susceptibility is used to characterize magnetic materials such as ferrites, Sendusts, semiconductors, superconductors, and other magnetic materials where surface barriers and effects of granularity are of performance interest.